The Boeing 737 Is A Family of short to medium range narrow body wing mounted engined twinjet airliner.
The Boeing 737 is the most successful JET airliner today. The Boeing 737 Competes With The MD-80/90 Family, and the Airbus A320 family.
Boeing plans to replace the 737 family with the Boeing Yellowstone Project Y1. The Y1 will begin development after the Boeing 787 Dreamliner (Y2).