Developed and manufactured in France and Italy by ATR (Aerei da Trasporto Regionale or Avions de transport régional), a joint venture formed by French aerospace company Aérospatiale (now Airbus) and Italian aviation conglomerate Aeritalia (now Leonardo S.p.A.). The number "42" in its name is derived from the aircraft's standard seating configuration in a passenger-carrying configuration, which typically varies between 40 and 52 passengers.

To date, all of the ATR series have been manufactured at the company's final assembly line in Toulouse, France; ATR benefits from its sharing of resources and technology with Airbus SE, which has continued to hold a 50 percent stake in the company. Improved models of the aircraft have been introduced, incorporating new avionics such as a glass cockpit, and the adoption of newer engine versions for enhanced performance, such as increased efficiency and reliability along with reductions in operational costs. This aircraft serves as the basis for the larger ATR 72, which was also developed during the late 1980s to complement its smaller sibling. The ATR 42 and ATR 72 have been produced side by side for decades.

For details of development, design, operational history and eight variants, click here.

Specifications below are for the ATR42-300 model.

Developed and produced in France and Italy by aircraft manufacturer ATR (Aerei da Trasporto Regionale or Avions de transport régional), a joint venture formed by French aerospace company Aérospatiale (now Airbus) and Italian aviation conglomerate Aeritalia (now Leonardo S.p.A.). The number "72" in its name is derived from the aircraft's standard seating configuration in a passenger-carrying configuration, which could seat 72–78 passengers in a single-class arrangement.

During the mid-1980s, ATR sought to introduce a larger airliner with capacity. This new regional airliner, designated as the ATR 72, was directly developed from the earlier ATR 42 and continued to share many commonalities with it; the principal difference between the two airliners was an increase in the maximum seating capacity from 48 to 78 passengers. This was principally achieved by stretching the fuselage by 4.5 m (15 ft), along with an increase of the wingspan, the use of more powerful engines, and increased fuel capacity by about 10%.

During 2000, the combined global ATR fleet reached its 10,000,000th flight, during which a distance around 4 billion km (2.5 billion statute miles) had been flown and around 450 million passengers had flown on board ATR-built aircraft.[6] The 2007 production set a new record for the programme's sales; a total of 113 new ATR aircraft had been ordered during a single year. By the end of 2014, ATR had received 1,000 orders for the type and delivered a total of 754, leaving a backlog of 246 aircraft.

For further details of the development, design, operational history and 18 variants and versions, click here.

Specifications below are for the ATR72-600 model.

The Aviation Traders ATL-98 Carvair is a retired large transport aircraft powered by four radial engines. It was a Douglas DC-4-based air ferry conversion developed by Freddie Laker's Aviation Traders (Engineering) Limited (ATL), with a capacity generally of 22 passengers in a rear cabin, and five cars loaded in at the front.

Freddie Laker's idea to convert surplus examples of the Douglas DC-4 and its military counterpart the C-54 Skymaster to carry cars was a relatively inexpensive solution to develop a successor to the rapidly aging and increasingly inadequate Bristol 170 Freighter, the car ferry airlines' mainstay since the late 1940s.

The Bristol Freighter's main drawback was its limited payload, in terms of the number of cars that fitted into a single aircraft. Even the "long-nosed" Mark 32 was able to accommodate only three cars (in addition to 20 passengers). This made carrying cars by air a very tricky business. If a booked car failed to turn up, the flight instantly became unprofitable as a result of the one-third cut in payload. This situation was made worse by the increasing average length of British cars during the 1950s. The average UK car in 1959 was 25 centimetres (9.8 in) longer than in 1950. The extreme seasonality of the car ferry business furthermore resulted in poor aircraft utilization outside peak periods. Moreover, repeated takeoffs and landings on short cross-Channel flights, in turbulent air at lower altitudes with tight turnarounds of as little as 20 minutes, made the aircraft prone to structural fatigue problems. These necessitated rigorous and costly modification programmes, thereby further increasing the type's operating costs on what were essentially low-yield routes.

When the major airlines replaced their obsolete piston airliners with new Boeing 707 and Douglas DC-8 jets on their prestige long-haul routes, the unit price of second-hand DC-4s dropped to as little as £50,000 (equivalent to £1.2 million today). The conversion of each of these airframes into car-passenger carriers cost about £80,000 (£1.9 million today). This was easily affordable by smaller airlines, such as the car ferry companies. Freddie Laker's cardboard model of a converted DC-4 featuring a door in the nose and a flight deck raised above the fuselage had shown that its payload was superior to the Bristol Freighter/Superfreighter. The aircraft was designed to accommodate five average-sized British cars plus 25 passengers as a result of the DC-4's longer and wider fuselage. British Air Ferries (BAF), for example, operated its Carvairs in a flexible configuration, either accommodating five cars and 22 passengers or two-three cars and 55 passengers, permitting it to change over from one configuration to the other in about 40 minutes. In addition, the DC-4's lack of pressurisation made it ideal for low-altitude cross-Channel flights that did not go high enough to require a pressurised cabin. This made the proposed structural conversion straightforward. The result was a new aircraft christened Carvair (derived from car-via-air).

Initially, it was thought that second-hand, pressurised Douglas DC-6 and Douglas DC-7 airframes could be converted into larger, "second generation" Carvairs within 15 years of the original DC-4-based Carvair's entry into service.

The conversion of the original aircraft entailed replacing the forward fuselage with one 8 feet 8 inches (2.64 m) longer, with a raised flightdeck in a bulbous "hump" (akin to the later Boeing 747) to allow a sideways hinged nose door. It also entailed more powerful wheel brakes and an enlarged tail, often thought to be a Douglas DC-7 unit, but actually a completely new design.[citation needed] The engines, four Pratt & Whitney R-2000 Twin Wasps, were unchanged.

The prototype conversion first flew on 21 June 1961. Twenty-one Carvairs were produced in the UK, with production of aircraft 1, 11 and 21 at Southend Airport and the balance at Stansted Airport. The final three aircraft were delivered to Australia's Ansett-ANA, which supplied its own DC-4s to ATL for conversion, unlike the previous 18 aircraft that were purchased by ATL and either sold on or transferred to associate company British United Air Ferries (BUAF). One of the two aircraft still flying in June 2007 was an ex-Ansett airframe. A second Ansett aircraft was abandoned at Phnom Penh in 1975. The first flight of the last conversion, number 21, for Ansett, was on 12 July 1968.

Basic price for a newly converted Carvair in 1960 was £150,000 (equivalent to £3.5 million today), and based on the use of a C54 airframe, whilst only two of the three Ansett airframes supplied were of the DC4 variant.

The Carvair was used by Aer Lingus, BUAF and BAF among others, and was used in Congo-Kinshasa during 1962–1963, under contract to the United Nations. Aircraft for Aer Lingus were quickly convertible between 55 seats and 22 seats with five cars. Some aircraft were pure freighters with only nine seats. One aircraft had 55 high-density seats and room for three cars. BAF was the last operator in Europe of the aircraft, keeping them flying into the 1970s.

The Avro 618 Ten or X was a passenger transport aircraft of the 1930s. It was a licensed version by Avro of the Fokker F.VIIB/3m. Smithy's "Southern Cross", VH-USU was a genuine Fokker, but five other aircraft in the Australian National Airways Ltd Southern fleet were Avro 618 Tens. (See table below).

In 1928 Avro came to an arrangement with Fokker to license production of its successful F.VIIB/3m for sale in the British Empire (except Canada). The Avro designation 618 Ten was adopted as the aircraft was capable of carrying two crew and eight passengers. After a modification of the centre motor mounting to accommodate British airworthiness requirements, the aircraft was first displayed at the 1929 Olympia Aero Show. The Avro 642 Eighteen used the same wing as the Ten but had a new fuselage for 16 passengers.

The first five aircraft were sold to the new Australian National Airways. The type entered service on 1 January 1930 on the Brisbane-Sydney route, and later Melbourne-Sydney. They were:

VH-UMF Southern Cloud
VH-UMG Southern Star
VH-UMH Southern Sky
VH-UMI Southern Moon
VH-UNA Southern Sun

Two of this fleet were lost in accidents: Southern Cloud in the Toolong range of the Australian Alps on 21 March 1931 (the wreckage was not found until 1958) and Southern Sun in Malaya in November 1931, while attempting the first airmail flight to the United Kingdom. The airline folded and the remaining aircraft were sold.

Southern Moon was rebuilt in 1933 for long-range flights, fitted with 330 hp (250 kW) Wright Whirlwind radial engines and restyled as VH-UXX Faith in Australia. The last surviving 618 Ten in Australia, it evacuated many people from New Guinea in 1941. Another two 618 Ten aircraft were also sold to Australian companies. Three of the 619 Five aircraft went to two Australian airlines, as did (after commercial service in Britain) the sole 642/2m.

The Avro 706 Ashton was a British prototype jet airliner made by Avro during the 1950s. Although it flew nearly a year after the de Havilland Comet, it represented an experimental programme and was never intended for commercial use.

The Avro 689 Tudor 9 was based on the Avro 689 Tudor II piston-engined airliner using experience on work on the Rolls-Royce Nene jet-powered experimental variant, the Tudor 8, which made its first flight on 6 September 1948. The Avro Type 689 Tudor 9, later renamed the Avro 706 Ashton, was a four-jet-engined research aeroplane powered by Rolls-Royce Nene engines paired in wing nacelles.

Six were built using the Tudor airframe, beginning with the conversion of Tudor I initially powered by Nene 5 engines. The Ashtons that followed incorporated the upgraded Nene 6 and featured an enlarged, "square-shaped" tail fin and tricycle landing gear replacing the original "taildragger" configuration. The engines were tightly grouped in two nacelles that were faired neatly into the wing but also extended below in streamlined pods. The four-engine arrangement compensated for the low thrust of the early jet engines and greatly reduced asymmetric effects in an "engine-out" scenario.

The crew was composed of a pilot, co-pilot, navigator, flight engineer and radio operator clustered together in the cockpit and front compartment of the Ashton. A larger complement could be carried in the spacious fuselage when warranted.

It was beaten to the air by only 13 days by the de Havilland Comet, thereby becoming the second jet airliner in the world. The name "Jetliner" was chosen as a shortening of the term "jet airliner", a term which is still in popular usage. The aircraft was considered suitable for busy routes along the US eastern seaboard and garnered intense interest, notably from Howard Hughes who even offered to start production under license. However continued delays in Avro's all-weather interceptor project, the Avro Canada CF-100 Canuck, led to an order to stop working on the project in 1951, with the prototype Jetliner later cut up for scrap.

Only one prototype was built, the second was cancelled during production and scrapped. Read more of the story of this airliner that never really was, including the unusual contract conditions here.

The Avro 691 Lancastrian was a Canadian and British passenger and mail transport aircraft of the 1940s and 1950s developed from the Avro Lancaster heavy bomber. The Lancaster was named after Lancaster, Lancashire; a Lancastrian is an inhabitant of Lancashire.

The Lancastrian was basically a modified Lancaster bomber without armour or armament and with the gun turrets replaced by streamlined metal fairings, including a new nose section. The initial batch was converted directly from Lancasters; later batches were new builds.

In 1943, Canada's Victory Aircraft converted a Lancaster X bomber for civilian transport duties with Trans-Canada Airlines (TCA). (After the war Victory Aircraft was purchased by what became Avro Canada). This conversion was a success, resulting in eight additional Lancaster Xs being converted. The "specials" were powered by Packard-built Merlin 38 engines and featured a lengthened, streamlined nose and tail cone. Range was increased by two 400 gal (1,818 L) Lancaster long-range fuel tanks fitted as standard in the bomb bay. These Lancastrians were used by TCA on its Montreal–Prestwick route.

The modification of abundant military aircraft into desperately needed civilian transports was common in the United Kingdom in the immediate postwar period; the Handley Page Halton was a similar conversion of the Halifax heavy bomber.

In 1945, deliveries commenced of 30 British-built Lancastrians for BOAC. On a demonstration flight on 23 April 1945, G-AGLF flew 13,500 mi (21,700 km) from England to Auckland, New Zealand in three days, 14 hours at an average speed of 220 mph (354 km/h).

The Lancastrian was fast, had a long range, and was capable of carrying a heavy load, but space inside was very limited as the Lancaster had been designed with space for its seven crew dispersed throughout the fuselage, and with the majority of the load being carried in the 33 ft (10.05 m) long bomb bay. Consequently, as passengers are bulky but low in weight, it was not suited to carry large numbers of passengers, but was suitable for mail and a small number of VIP passengers. BOAC used it for flights between England and Australia from 31 May 1945. It also served with the RAF; RAF Lancaster I serial number PD328, was converted to a Lancastrian and renamed Aries, as well as serving with Qantas and Flota Aérea Mercante Argentina.

Lancastrians were used during the Berlin Airlift to transport petrol; 15 aircraft made over 5,000 trips. In 1946 a Lancastrian operated by BSAA was the first aircraft to make a scheduled flight from the then-newly opened London Heathrow Airport.

Lancastrian engine testbeds

With the advent of gas turbine engines there emerged a need to test the new engines in a controlled flight environment in well instrumented installations. An ideal candidate emerged as the Avro Lancastrian which could easily accommodate the test instrumentation as well as fly on the power of two piston engines if required. Several Lancastrians were allocated for engine test-bed work with turbojet engines replacing the outer Merlin engines or test piston engines in the inner nacelles. Fuel arrangements varied but could include kerosene jet fuel in outer wing tanks or fuselage tanks, with avgas carried in remaining fuel tanks.

Variants

Lancaster XPP
Nine built by converting Lancaster Mk. Xs at Victory Aircraft Ltd Canada.
Lancastrian C.1
Nine-seat transport aircraft for BOAC and Qantas. Royal Air Force designation Lancastrian C.1 to Specification 16/44. A total of 23 built by Avro
Lancastrian C.2
Nine-seat military transport aircraft for the RAF. A total of 33 built by Avro
Lancastrian 3
13-seat transport aircraft for British South American Airways. A total of 18 built by Avro
Lancastrian C.4
Ten to 13-seat military transport aircraft for the RAF. Eight built by Avro

Customers saw the aircraft as little more than a pressurised DC-4 Skymaster, and few orders were forthcoming, important customers preferring to buy US aircraft. The tailwheel undercarriage layout was also dated and a disadvantage. It was designed by Roy Chadwick who, due to wartime restrictions, could not design a completely new aircraft, but had to use existing parts, tools and jigs. It was the first British pressurised civilian aircraft, although the prototype initially flew unpressurised. The prototype Tudor I had 1,750 hp (1,305 kW) Rolls-Royce Merlin 102 engines, but the standard engines were 1,770 hp (1,320 kW) Merlin 621s.

The passenger capacity of the Avro 688 was considered unsatisfactory, so a larger version was planned from the outset. Designated the Avro 689 (also Avro XXI), the Tudor II was designed as a 60-seat passenger aircraft for BOAC, with the fuselage lengthened to 105 ft 7 in (32.18 m) compared to the Tudor I's 79 ft 6 in (24.23 m) and the fuselage increased by 1 ft (0.30 m) to 11 ft (3.4 m) diameter, making it the largest UK airliner at the time.

At the end of 1944, while it was still in the design stage, BOAC, Qantas and South African Airways decided to standardise on the Tudor II for Commonwealth air routes, and BOAC increased its initial order for 30 examples to 79.

There were 9 versions of the Tudor plus 3 freighter versions. Tudor 9 was fitted with four jet engines, paired in two streamlines nacelles. This was later converted to tricycle undercarriage as the Avro Ashton. The Ashton, four of which were built, was not intended for commercial use, instead as an experimental aircraft, and was used as a testbed for jet engines slung beneath the fuselage.

Further details of the development of the Tudor can be found here.

The specifications below are for the original Avro 688 Tudor 1 Series.

Tudor 1 Series

Tudor 2 Series

Jet powered Tudor 9

Ashton. (Note jet enginge slung below fuselage for testing.)

The design was derived from the Avro Lancaster heavy bomber, several sections of the York and Lancaster being identical. Due to the importance of Lancaster production, York output proceeded at a slow pace until 1944, after which a higher priority was placed upon transport aircraft.

The York saw service in military and civilian roles with various operators between 1943 and 1964. In civilian service, British South American Airways (BSAA) and British Overseas Airways Corporation (BOAC) were the largest users of the type. In military service, large numbers of Yorks were used for air-supply missions during the Berlin Blockade 1948–49. A number of the type were used as air transports of heads of state and government; VIPs who flew on Yorks, included British Prime Minister Winston Churchill, French General Charles de Gaulle, Indian Governor-General Lord Mountbatten and South African Prime Minister Jan Smuts.

The RAAF operated an Avro York in the Governor General's flight.

For more information on origins, design, production and operational history, click here.

It was the second short-haul jet airliner to enter service, following the French Sud Aviation Caravelle. The aircraft was also produced under licence in Romania during the 1980s as the Rombac One-Eleven.

The aircraft proved popular with domestic airlines and various international operators. Over half of the One-Eleven's sales at launch were to the US. The One-Eleven was one of the most successful British airliner designs, and served until a widespread retirement in the 1990s, which was partly due to the introduction of aircraft noise restrictions in many European nations. As of May 2019, no BAC One-Eleven aircraft remain in service following Northrop-Grumman's retirement of their last aircraft. A total of 244 aircraft were built between 1963–1982 (United Kingdom) and 1982–1989 (Romania).

The RAAF operated two BAC 1-11s in No 34 VIP Squadron in Canberra.

For more details of the BAC 1-11 and variants, click here.

The specifications below are for the basic 200 model.

The Bach Air Yacht was a trimotor airliner produced in the United States in the 1920s. Typical of its day, it was a high-wing braced monoplane, with fixed tailwheel undercarriage. Unusual for airliners of the late 1920s (due to legislation that forbade carrying passengers in wooden aircraft), the Air Yachts were constructed almost entirely of wood with steel fittings, undercarriage, and struts. Different models were powered by varying combinations of Wright, Ryan-Siemens, Kinner, Comet, and Pratt & Whitney engines, a large engine in the nose of the aircraft, and two smaller "helpers" under the wings in nacelles supported by struts. As with so many aircraft companies of the late 1920s, the Bach Aircraft Company succumbed to the Great Depression, thus further development of the Air Yacht was abandoned after the 3-CT-9.

On 26 July 1929, a 3-CT-9 model piloted by Waldo Waterman set a new altitude record, lifting a 1,000 kg payload to 20,820 ft (6,347 m).

For details of the 11 variants, click here.

The Barkley-Grow T8P-1 was an airliner developed in the United States shortly before the Second World War. Although it saw limited production, the type was well-received as a bush plane in Canada.

Typical for the era, the Barkley-Grow T8P-1 was a low-wing monoplane of all-metal construction with a twin tail (an additional third tail was installed, à la Lockheed Constellation, when fitted with floats). The T8P (standing for Transport, 8 Passenger) was designed to be simple and rugged, thus the main units of the tailwheel undercarriage were not retractable, and this may have negatively impacted the type's reception in the marketplace. A novel design feature, however, was the wing structure. Barkley used what might be called a "horizontal cell" technique that has no ribs or spars. Long tapered strips of aluminium were bent to form V shapes which were then riveted tip to tip to form an "X". These "X"s are riveted inside the wing side by side to produce the long "cells". This wing structure was unique to the Barkley-Grow and according to mechanics who worked on the aircraft it was very light, very stiff, very expensive to build, and difficult to repair if damaged, but it gave no problems in service.

Like its two main competitors, the Lockheed Model 12 Electra Junior and the Beech 18, the T8P-1 was originally designed to a 1935 Bureau of Air Commerce specification (eventually won by the Lockheed entry).

Sales in the US were disappointing, only 11 being built, and most machines (seven) were sold to Canada, where the fixed undercarriage was no obstacle to the fitting of skis or pontoons. One was selected for a record flight from Washington D.C. to Peru, and another was used in the Antarctic by the US Navy.

It was designed, and is primarily used, as a regional airliner. It is also used as a freight aircraft and corporate transport, and by several governmental and military organisations. With customers favoring larger regional jets, Raytheon ended production in October 2002.

The aircraft was designed to carry passengers in all weather conditions from airports with relatively short runways. It is capable of flying in excess of 600 miles (970 km), although few operators use its full-fuel range. In terms of the number of aircraft built and its continued use by many passenger airlines and other users, it is one of the most popular 19-passenger airliners in history.

The Beechcraft 1900's design lineage began in 1949 with the Beechcraft Model 50 Twin Bonanza, a 5-passenger, reciprocating engine utility aircraft designed for the U.S. Army. A larger passenger cabin was added to the Twin Bonanza's airframe, and called the Model 65 Queen Air. This aircraft was, in turn, further modified by adding turboprop engines and cabin pressurization, and named the Model 90 King Air. A stretched version of the King Air was later developed and designated the Model 200 Super King Air. Beechcraft developed the 1900 directly from the Super King Air, in order to provide a pressurized commuterliner to compete with the Swearingen Metro and the British Aerospace Jetstream.

The 1900 entered service in February 1984,[5] with the first ExecLiner corporate version delivered in 1985. A total of 695 Beechcraft 1900 aircraft were built, making the airliner the best-selling 19-passenger airliner in history. Many airlines continue to fly the 1900. While Federal Aviation Regulations require two pilots for passenger airline operations, the 1900 is designed and certificated for single-pilot operation in corporate or cargo settings, as is the King Air.

For details of the six variants, click here.

Specifications below are for the 1900D model.

 It was developed specifically for Aeroflot local service routes using short, grass airstrips. It was also designed to be used in the light transport, aerial survey and air ambulance roles. It competed against the Antonov An-28 and the Czechoslovakian LET-410.

The original design featured interconnected engines, so that in case of one engine failing, the remaining engine could drive both propellers. This feature was not implemented in the production version.

The first prototype flew on 3 March 1967, fitted with Shvetsov ASh-21 piston engines, while the first production prototype flew on 18 July 1968, using more powerful Glushenkov TVD-10 turboprop engines. The first deliveries to Aeroflot were in mid-1969.

The Be-30 was designed for a flight crew of two with passenger arrangements for 14 (in the Be-30) to a maximum of 17 (in the Be-32) seated two abreast. Corporate shuttle configuration seated seven. The air ambulance configuration could accommodate nine stretcher patients, six seated patients and one medical attendant.

Three Be-30s and five Be-32s were built in the late 1960s before the program was terminated. In the early 1990s one of the original Be-32s was converted to a Be-32K demonstrator and presented at the 1993 Paris and Dubai air shows. It was painted in the colors of the now defunct Moscow Airways which had ordered 50 aircraft but ceased operations before any could be built or delivered.

3 Be-30s and 5 Be-32s were built in the late 1960s before program terminated. One of the original Be-32s was converted to Be-32K demonstrator.

Variants
Be-30 Prototype first flew on 3 March 1967, powered by two 550 kW (740 hp) Shvetsov ASh-21 radial piston engines, driving three-blade constant speed propellers. Fuel capacity 1,000 kg (2,200 lb).
Be-30: Production model
Be-30A: With 'high-density' seating for 21-23 passengers
Be-32: Upgraded model first displayed in 1993. Two 754 kW (1,011 shp) Glushenkov TVD-10B turboprops driving three-blade constant speed propellers.
Be-32K: 'Westernized' version with two 820 kW (1,100 shp) Pratt & Whitney Canada PT6A-65B turboprops driving three-blade Hartzell reversible pitch propellers. Fuel capacity 2,250 L (590 US gal).

Be-30

Be-32

The Bloch MB.120 was a French three-engine colonial transport aircraft built by Société des Avions Marcel Bloch during the 1930s.

The MB.120 design was selected by the French government for transport use in French overseas territories. It was an all-metal high-wing cantilever monoplane. The prototype was re-worked from the MB.71. Standard accommodation was for a crew of three and up to 10 passengers. The civil aircraft normally carried only four passengers, the rest of the aircraft was filled with mail. Ten production aircraft were produced, six for civil use and four for the French Air Force.

The aircraft entered operation in 1934 for Air Afrique, which was a new airline set up by the French government on 11 May 1934 to provide service between the French African territories. Both the civil and military aircraft served only in French Africa.

Variants

MB.120.01 : First prototype.
MB.120 : Three-engined colonial transport aircraft. Ten built.

The Bloch MB.160 was a fourteen-seat French airliner intended for use in the French African colonies. Three were built and two entered service with Régie Air-Afrique at the start of World War II. Developments included the Bloch MB.162 bomber which was too late for service and the Sud-Est SE.161 Languedoc, one hundred of which were built post-war.

The first flight of the Bloch MB.160 was on 18 June 1937, piloted by André Curvale at Villacoublay, Marcel Bloch's base.

On 20 August, now named the Lieutenant-Génin, it was one of thirteen aircraft from three countries (France, Italy and the UK) to take part in a 6,190 km (3,850 mi) race from France to Syria and back, flying from Istres to Damascus and returning to Paris. Nine finished, with Italian Savoia-Marchetti SM.79s in the first three places; the Bloch, piloted by Captain François, was seventh, taking 17h 38 min at an average speed of 273 km/h (170 mph).

On 17 October the MB.160 set a new world speed record for an aircraft carrying a 5,000 kg (11,000 lb) useful load over 2,000 km (1,200 mi), averaging 307.455 km/h (191.044 mph; 166.012 kn).

By March 1938 it had completed testing at Marignane and had returned to Villacoublay for minor aileron alterations and for some internal revision. By this time a second example was under way. As late as November 1938 one Bloch MB.160 was back for further modifications to the wing. In July 1939 the first of two delivered to Air-Afrique (only the second and third Bloch 160s appeared on the French civil register) had completed its exploration flights, with passengers, in Algeria.

Though only three MB.160s were built a development of it, the MB.161, was the pre-war prototype of the Sud-Est SE.161 Languedoc. Its first flight was in September 1939; one hundred of them were built post-war. The Languedoc had a 7% greater span, twin end plate fins and a slightly shorter fuselage. 1,150 hp (860 kW) Gnome-Rhône 14N44/45 radial engines replaced the Hispano-Suizas in the prototype but production aircraft had 890 kW (1,200 hp) Pratt & Whitney R-1830-92 Twin Wasp radials.

The MB.162 was the final MB.160 variant, initially developed for long range flights but flown as a bomber. Like the MB.161, it had twin fins and Gnome-Rhône 14N engines. Only one was built, making its first flight on 1 June 1940.

For details of design and variants, click here.

The Bloch MB.220 was a French twin-engine passenger transport airplane built by Société des Avions Marcel Bloch during the 1930s.

The MB.220 was an all-metal low-wing cantilever monoplane. It was powered by two Gnome-Rhône 14N radial engines and had a retractable landing gear. Normal crew was four, with room for 16 passengers, with eight seats each side of a central aisle. The prototype first flew in December 1935, and was followed by 16 production aircraft.

Six examples survived the war and were modified as the MB.221 with Wright R-1820-97 Cyclone engines.

By the middle of 1938, the type was being utilised by Air France on European routes. The first service of the type (between Le Bourget and Croydon (in south of London) was flown on 27 March 1938 with a scheduled time of 1 hour 15 minutes. During World War II, most MB.220s were taken over as military transports, including service with German, Free French and Vichy French air forces. Air France continued to fly the aircraft (as MB.221s) after the war on short-range European routes. It sold four aircraft in 1949 but within a year all had been withdrawn from service.

Variants

MB.220
One prototype, registration F-AOHA, and 16 production aircraft with Gnome-Rhône 14N-16 and Gnome-Rhône 14N-17 engines (opposite rotation).
MB.221
Six survivors, registration F-AOHC to F-AOHF, F-AQNM and F-AQNN, re-engined with the Wright R-1820-97 Cyclone.

The Boeing Model 247 was considered the first such aircraft to fully incorporate advances such as all-metal (anodized aluminium) semimonocoque construction, a fully cantilevered wing and retractable landing gear. Other advanced features included control surface trim tabs, an autopilot and de-icing boots for the wings and tailplane.

"Ordered off the drawing board", the 247 first flew on February 8, 1933, and entered service later that year. Subsequent development in airliner design saw engines and airframes becoming larger and four-engined designs emerged, but no significant changes to this basic formula appeared until cabin pressurization and high altitude cruise were introduced in 1940, with the Boeing 307 Stratoliner.

The 247 was the first twin-engined passenger transport able to fly on one engine. With controllable pitch propellers (standard equipment on the 247D), the 247 could maintain 11,500 feet (3,500 m) at maximum gross takeoff weight.

 Its combination of features set the standard for the Douglas DC-1 and other airliners before World War II.

During the 1930s, aircraft designs were often proven in air races and other aerial contests. A modified 247D was entered in the MacRobertson Air Race from England to Australia, flown by Colonel Roscoe Turner and Clyde Pangborn. The 247, race number "57," was essentially a production model but all airliner furnishings were removed to accommodate eight additional fuselage fuel tanks. The MacRobertson Air Race attracted aircraft entries from all over the globe, including prototypes as well as established production types, with the gruelling course considered an excellent proving ground as well as an opportunity to gain worldwide attention. Turner and Pangborn came in second place in the transport section (and third overall), behind the Boeing 247's eventual rival, the new Douglas DC-2.

A total of 75 were built over seven variants. The specifications below are for the 247D variant.

For more information on hte development, design and operational history of the 247, click here.

It was the first to offer a pressurized cabin, allowing it to cruise at an altitude of 20,000 ft (6,000 m), well above many weather disturbances. The pressure differential was 2.5 psi (17 kPa), so at 14,700 ft (4,480 m) the cabin air pressure was equivalent to an altitude of 8,000 ft (2,440 m). The Model 307 had capacity for a crew of six and 33 passengers. The cabin was nearly 12 ft (3.6 m) across. It was the first land-based aircraft to include a flight engineer as a crew member (several flying boats had included a flight engineer position earlier). In addition to its civilian service it was also flown as the Boeing C-75 Stratoliner by the United States Army Air Forces, who used it as a long-range cargolift aircraft.

In 1935, Boeing designed a four-engine airliner based on its B-17 heavy bomber (Boeing Model 299), then in development, calling it the Model 307. It combined the wings, tail, rudder, landing gear, and engines from their production B-17C with a new, circular cross-section fuselage of 138 in (351 cm) diameter, designed to allow pressurization.

The first order, for two 307s (named Stratoliners), was placed in 1937 by Pan American Airways. Pan Am soon increased this to six, and a second order for five from Transcontinental & Western Air (TWA) prompted Boeing to begin production on an initial batch of the airliner. Pan Am received its initial order and TWA received its order, but only one of the second batch of four Pan Am aircraft was delivered before war intervened and put a halt to civil aircraft production.

For information on the operational history, conversion to C-75, and the five variants, and the individual histories of the 10 airframes built, click here.

The Stratocruiser's first flight was on July 8, 1947. Its design was advanced for its day; its innovative features included two passenger decks and a pressurized cabin, a relatively new feature on transport aircraft. It could carry up to 100 passengers on the main deck plus 14 in the lower deck lounge; typical seating was for 63 or 84 passengers or 28 berthed and five seated passengers.

The Stratocruiser was larger than the Douglas DC-6 and Lockheed Constellation and cost more to buy and operate. Its reliability was poor, chiefly due to problems with the four 28-cylinder Pratt & Whitney R-4360 Wasp Major radial engines and structural and control problems with their propellers. Only 55 Model 377s were built for airlines, along with the single prototype.

The 377 shared the distinctive design of the C-97, with a "double-bubble" fuselage cross-section, resembling an inverted figure-8, with 6,600 ft³ (187 m³) of interior space shared between two passenger decks. Outside diameter of the upper lobe was 132 inches, compared to 125 inches for the DC-6 and other Douglas types (and 148 inches for today's 737). The lower deck served as a lounge, seating 14. The 377 had innovations such as higher cabin pressure and air conditioning; the superchargers on the four Pratt & Whitney R-4360 engines increased power at altitude and allowed constant cabin pressure. The wing was the Boeing 117 airfoil, regarded as the "fastest wing of its time". In all, 4,000,000 man-hours went into the engineering of the 377. It was also one of but a few double deck airliners, another being its French contemporary, the Breguet Deux-Ponts, as well as Boeing's own 747 and the Airbus A380. A total of 56 were built, one prototype (later reconditioned) and 55 production aircraft.

Aero Spacelines Guppy

A company called Aero Spacelines was converting old 377s to aircraft called Guppys in the 1960s. There were three types: the Pregnant Guppy, Super Guppy, and Mini Guppy. They had an extension to the top of the fuselage to enable them to carry large aircraft parts between manufacturing sites.

The first was the Pregnant Guppy, followed by the Super Guppy, and finally the Mini Guppy. The Super Guppy and the Mini Guppy had turboprop engines.

For more details of the development,design,operational history of the 377 and its 10 variants, as well as the Guppies, click here.

Developed from the Boeing 367-80, a prototype first flown in 1954, the initial 707-120 first flew on December 20, 1957. Pan American World Airways began regular 707 service on October 26, 1958, and it was built until 1979. A quadjet, the 707 has a swept wing with podded engines. Derived from the 367-80 prototype, its larger fuselage cross-section allowed six-abreast economy seating, retained in the later 720, 727, 737, and 757.

Although it was not the first commercial jetliner in service, the 707 was the first to be widespread and is often credited with beginning the Jet Age.[7] It dominated passenger air transport in the 1960s and remained common through the 1970s, on domestic, transcontinental, and transatlantic flights, as well as cargo and military applications. It established Boeing as a dominant airliner manufacturer with its 7x7 series.

The initial, 145-foot-long (44 m) 707-120 was powered by Pratt & Whitney JT3C turbojet engines. The shortened long-range 707-138 and the lighter 707-220 entered service in 1959. The longer range, heavier 707-300/400 series have a larger wing and stretched slightly by 8 feet (2.4 m). Powered by Pratt & Whitney JT4A turbojets, the 707-320 entered service in 1959, and the 707-420 with Rolls-Royce Conway turbofans in 1960.

For much more information on this iconic aircraft and its many models, click here.

The specifications below are for the 707-320B model.

The Boeing 720 is a retired American narrow-body airliner produced by Boeing Commercial Airplanes. Announced in July 1957 as a 707 derivative for shorter flights from shorter runways, the 720 first flew on November 23, 1959. Its type certificate was issued on June 30, 1960, and it entered service with United Airlines on July 5, 1960. A total of 154 Boeing 720s and 720Bs were built; production ended in 1967. As a derivative, the 720 had low development costs, allowing profitability despite relatively few sales.

Compared to the 707-120, it has a length reduced by 8.33 feet (2.54 m), a modified wing and a lightened airframe for a lower maximum takeoff weight. Originally designed to be powered by four Pratt & Whitney JT3C turbojets, the initial 720 could cover a 2,800-nautical-mile [nmi] (5,200 km; 3,200 mi) range with 131 passengers in two classes. The reconfigured 720B, powered by JT3D turbofans, first flew on October 6, 1960, and entered service in March 1961. It could seat 156 passengers in one class over a 3,200-nautical-mile [nmi] (5,900 km; 3,700 mi) range. Some 720s were later converted to the 720B specification. It was succeeded by the Boeing 727 trijet.

Shorter range 707

Boeing announced its plans to develop a new version of the 707 in July 1957. It was developed from the 707-120 to provide for short- to medium-range flights from shorter runways. The model was originally designated 707-020 before being changed to 720 at the input of United Airlines. Compared to the 707-120, it has four fewer frames in front of the wing and one fewer aft: a total length reduction of 8 feet 4 inches (2.54 m).

The new model was designed to a lower maximum takeoff weight with a modified wing and a lightened airframe. The wing modifications included Krueger flaps outboard of the outboard engines, lowering take-off and landing speeds—thus shortening runway length requirements—and a thickened inboard leading edge section, with a slightly greater sweep. This modification increased the top speed over the 707-120. It had four Pratt & Whitney JT3C-7 turbojet engines producing 12,500 lbf (55.6 kN) each.

At one point in the development phase, it was known as the 707-020, then 717-020, although this was the Boeing model designation of the KC-135 and remained unused for a commercial airliner until it was applied to the MD-95, following Boeing's merger with McDonnell Douglas in 1997.

Because the aircraft systems were similar to the Boeing 707, no prototype Boeing 720 was built; any different systems were tested on the Boeing 367-80. The first 720 took its maiden flight on November 23, 1959. The type certificate for the 720 was issued on June 30, 1960. It first entered service with United Airlines on July 5, 1960;

65 of the original version were built.

The 720B version of the 720 had JT3D turbofan engines, producing 17,000 lbf (75.6 kN) each. The JT3D engines had lower fuel consumption and higher thrust. The maximum takeoff weight for the 720B was increased to 234,000 lb (106,000 kg). The 720B first took to the skies on October 6, 1960, and received certification and entered service with American Airlines in March 1961;[7] 89 720Bs were built in addition to conversions of American's 10 existing 720s.

As a modification of an existing model, the 720 had minimal research and development costs, which allowed it to be successful despite few sales. The company built 154 Boeing 720s and 720Bs from 1959 to 1967. The 720's wing modification was later added on the 707-120B and on 707-120s retrofitted to the B standard.

Design

The Boeing 720 is a four-engined low-wing cantilever monoplane. Although it was similar to the Boeing 707, compared with the 707-120, it was 8 ft 4 in (2.54 m) shorter in length, and had a lighter structure through use of lighter forged metal parts and thinner fuselage skins and structures.

Fuselage

The rearmost of the 707's over-wing emergency exits was deleted on each side, which reduced passenger capacity, while two over-wing exits were an option for higher-density configurations.

Wings

The 720 uses an improved wing based on the 707 wing. The wingspan remained the same as the 707-120. For the 720, the wing was changed between the fuselage and inner engines by adding a wing root glove. This glove reduced the drag of the wing by decambering the root, which reduced the "middle effect", thereby increasing the effective local wing sweep. The wing root glove reportedly increased the drag divergence Mach number of the wing by Mach 0.02.

Engines

Though initially fitted with turbojet engines, the dominant engine for the Boeing 720 was the Pratt & Whitney JT3D, a turbofan variant of the JT3C with lower fuel consumption and higher thrust. JT3D-engined 720s had a "B" suffix; some of American's 720Bs were conversions of JT3C-powered 720s.

Like the 707, the 720/720B used engine-driven turbocompressors to supply high-pressure air for cabin pressurization. The engines could not supply sufficient bleed air for this purpose without a serious loss of thrust. The small air inlets and associated humps are visible just above the main engine inlets on the two inner engine pods of all 720s and 720Bs; the lack of the turbocompressor inlet on the outer starboard pod (number 4 engine) helps spotters distinguish 720/720Bs from most 707s, which had three turbocompressors.

For Operational History, click here.

Variants 

720

First production variant with four Pratt & Whitney JT3C turbojet engines

Several high-density seat configurations delivered to Eastern Airlines included four over-wing escape hatches and brake cooling fans to effect quick turns on short-haul sectors.[citation needed] These aircraft, designated "720-025", were certificated to carry up to 170 passengers, provided that certain safety requirements were met.

720B

Improved variant with four Pratt & Whitney JT3D turbofan engines; American Airlines converted its 720s to 720B standard.

The 727 followed the 707, a quad-jet airliner, with which it shares its upper fuselage cross-section and cockpit design. The 727-100 first flew in February 1963 and entered service with Eastern Air Lines in February 1964; the stretched 727-200 flew in July 1967 and entered service with Northeast Airlines that December. The 727 became a mainstay of airlines' domestic route networks and was also used on short- and medium-range international routes. Passenger, freighter, and convertible versions of the 727 were built. A total of 1832 aircraft were built between 1962 and 1984. The 727 was operated in Australia by Ansett-ANA (later Ansett Airlines Australia and Ansett Australia) and TAA (later Australian Airlines and Qantas).

For the full Boeing 727 history, click here.

Developed to supplement the 727 on short and thin routes, the twinjet retains the 707 fuselage cross-section and nose with two underwing turbofans. Envisioned in 1964, the initial 737-100 made its first flight in April 1967 and entered service in February 1968 with Lufthansa. The lengthened 737-200 entered service in April 1968. It evolved through four generations, offering several variants for 85 to 215 passengers.

The initial concept featured podded engines on the aft fuselage, a T-tail as with the 727, and five-abreast seating, but engineer Joe Sutter instead placed the engines under the wings to lighten the structure and enabling the fuselage to be widened to six-abreast seating.

As of December 2019, 15,156 Boeing 737s have been ordered and 10,571 delivered. Initially, its main competitor was the McDonnell Douglas DC-9, followed by its MD-80/MD-90 derivatives. It was the highest-selling commercial aircraft until being surpassed by the competing Airbus A320 family in October 2019, but maintaining the record in total deliveries. The current 737 MAX, designed to compete with the A320neo was grounded worldwide in March 2019 following two fatal crashes.

For more information, including the many models and variants, click here.

Specifications below are for models 737-600/-700/-800/-900