Aircraft studies on Instagram: "Spectacular Wingsuit Jump from a DC-9 A wingsuit skydiver made a breathtaking exit through the open hatch of a McDonnell Douglas DC-9 passenger jet, heading straight into free flight. The jump took place from an altitude of around 4,000 meters (13,000 ft) — the maximum height athletes can usually operate without oxygen support. Above this level, supplemental oxygen would be required. The rare combination of a classic DC-9 airliner and a wingsuit jump created an un