The Tupolev Tu-144
Like the Concorde, the Tupolev Tu-144 was also a supersonic airliner designed in the late ‘70s. Sadly, its first passenger prototype crashed during the Paris Air show because 22 of its 24 central systems failed and made it crash. Two airframes used were failures as well. It was flown 55 times and then abandoned.
The Tupolev Tu-144
The Dassault Balzac V
There are many ideas that look great on paper but are actually terrible ideas. That was what happened with this one. The French hoped to make a fighter jet able to take off and land vertically. It drew inspiration from the Mirage III. During its testing phase, a pair of pilots died. It did not stop the French from working on a prototype, but it only crashed. It’s a good thing the pilot ejected himself to safety!
The Dassault Balzac V