A trijet is a jet aircraft powered by three jet engines. In general, passenger airline trijets are considered to be second-generation jet airliners, due to their innovative engine locations, in addition to the advancement of turbofan technology. Trijets are more efficient than quadjets, but not as efficient as twinjets, which replaced trijets as larger and more reliable turbofan engines became available.
One of the first trijets was the Boeing 727 airliner.
Dassault Falcon 900EX. The 900 and its derivatives, the Falcon 7x and 8x, are the only trijets in the world currently in production.
"Straight-through" central engine layout on the DC-10-based KC-10
The McDonnell Douglas MD-11 is the most recent airliner-size trijet produced.
A jet aircraft is an aircraft propelled by one or more jet engines.
McDonnell Douglas DC-10 of Continental Airlines is an example of a Trijet configuration
The Heinkel He 178 was the first aircraft to fly on turbojet power, in August 1939
Boeing 707
The Concorde was the longest running commercial SST providing service from 1976 to 2003