The Boeing 737 Classic is a family of Boeing 737s. The Boeing 737 Classic series is made up of the Boeing 737-300, -400 and -500. These planes were not called the 737 Classics until the Boeing 737 Next Generation family was made. Before the 737 Next Generation family, the 737 Classics were called the 'new generation'. The 737 Classics were made from 1984 to 2000. 1,988 aircraft were made.