And lift based on speed and wing design. There is a crossover where the stall speed and flight speed merge.Well the Boeing 787 can fly much higher than older metal airliners. Unlike metal, Carbon composite experience no compression or expansion at higher altitudes. The service ceiling of the Rafale as listed by the manufacturer is 50,000 ft but it can cruise at 60,000 ft . The ceiling of the aircraft is limited only by the supply of oxygen to the engine.