The Boeing 737 is a long line of aircraft built by Boeing for the short to medium haul sector of commercial aviation. Since its introduction in the 1960s, it has seen many modifications and variants to keep it competitive in our modern aviation world. This makes the 737 the longest running family of aircraft in commercial aviation.
The 737 rivals the Airbus a320 family which was introduced in the 1980s. Both planes are used for short to medium ranged flights, and both have remained as some of the most used commercial aircraft in the world.