content: https://en.wikipedia.org/wiki/Concorde#Retirement  They cited low passenger numbers following the 25 July 2000 crash, the slump in air travel following the September 11, 2001 attacks, and rising maintenance costs. Although Concorde was technologically advanced when introduced in the 1970s, 30 years later, its analogue cockpit was dated. There had been little commercial pressure to upgrade Concorde due to a lack of competing aircraft, unlike other airliners of the same era such as the Boeing 747. By its retirement, it was the last aircraft in British Airways' fleet that had a flight engineer; other aircraft, such as the modernised 747-400, had eliminated the role.