Boeing 737, might be the most popular single aisle, narrow body aircraft in the world. After the success of Boeing 737 - 200 Advanced, Boeing introduced the Classic series Boeing 737 - 300/400/500. Boeing 737 - 300 first flew in 1984, followed by the 737 - 400 in 1985 and 737 - 500 in 1987.
Boeing 737 - Next Generation is the name given for the Boeing 737 - 600/700/800/900 series, the short and medium range aircraft, single aisle narrow body aircraft first introduced in 1996.
