The Boeing 737 twin engine jetliner was to become Boeing's greatest success. Launched in 1967, the short range transport entered service the following year, and has remained in production ever since. In the 737, they have combined the best of all previous Boeing air craft. Among these is the fact that it has one of the lowest approach speeds of any jet transport, a great asset when landing at smaller airports with shorter runways. It also required minimum equipment for use in refueling. However, despite all its advantages, the 737 was soon overshadowed by the new, improved 747 Jumbo jet.