737 is the world's most popular and reliable commercial jet transport. The 737 family has won orders for more than 5,200 airplanes, which is more airplanes than The Boeing Company's biggest competitor has won for its entire product line since it began business. The 737 - a short-to-medium-range airplane - is based on a key Boeing philosophy of delivering added value to airlines with reliability, simplicity and reduced operating and maintenance costs.