It was all Planned, approved and no doubt rehearsed. They formated with the second slightly above and behind the first Best for wake turbulence. The Planes were in the Two teams colours. Near empty there's a giant excess of Power and the control response available will handle lots of turbulence so is very adequate The height of the stadium would be very accurately known, so it's not a great effort to be a SET distance above it. These sort of Planes often do in flight refueling in other roles, which is ultra precise and quite risky by comparison.. I wouldn't use the Word "Ponderous" for something with the speed, Power to Weight and controllability of these sorts of Planes..