Boeing 737s main competition is the short to medium range Airbus A320 family.
The Airbus A320 family consists of short - to medium-range , narrow-body , commercial passenger twin-engine jet airliners manufactured by Airbus . The Boeing 737 is an American short - to medium-range twinjet narrow-body airliner . Many 737s serve markets previously filled by 707 , 727 , 757 , DC-9 , and MD-80 / MD-90 airliners , and the aircraft currently competes primarily with the Airbus A320 family .