喷气飞机的发展使亚音速飞机划分成两类。第一类是喷气飞机。这类飞机的飞行速度高(略低于1马赫),翼载大(约为每平方米488千克),要求跑道长于1525米。第二类是螺桨飞机,其使用活塞式发动机或涡轮螺桨发动机。这类飞行器的速度约为0.5马赫,翼载小(每平方米约为244千克或更小),使用跑道可短于1525米。喷气飞机能在9150～12200米高度高效巡航飞行,但代价是跑道要长。使用螺桨式飞机,其运输效率低,舒适性也差,但可使用较短的跑 The development of jet aircraft divided the subsonic aircraft into two categories. The first category is jet aircraft. Aircraft of this type fly at high speeds (slightly below Mach 1) and fly large (about 488 kilograms per square meter), requiring runways longer than 1,525 meters. The second category is propeller aircraft, which use piston engines or turboprop engines. The speed of such aircraft is about Mach 0.5, with small wings (about 244 kg / m 2 or less) and runways shorter than 1,525 meters. Jet aircraft can cruise efficiently at 9,150-12,200 meters, but at the expense of longer runways. The use of propeller aircraft, the transport efficiency is low, comfort is poor, but can use a shorter run