The Tupolev Tu-154 is a three-engined, medium-range, narrow-body airliner designed in the mid-1960s and manufactured by Tupolev. A workhorse of Soviet and (subsequently) Russian airlines for several decades, it carried half of all passengers flown by Aeroflot and its subsidiaries, remaining the standard domestic-route airliner of Russia and former Soviet states until the mid-2000s. It was exported to 17 non-Russian airlines and used as a head-of-state transport by the air forces of several countries.
Tupolev Tu-154
Tu-154 for Russian Ministry of Defence Manufacturing, Aviakor plant, 2009, one of several airframes built in the 1990s and left unsold
Tupolev Tu-154B-1 of Palair Macedonian at Zurich Airport in 1992
The cockpit of the Tupolev Tu-154
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.