The MiG-23
The Mikoyan-Gurevich MiG-23 was created to be a variable-geometry fighter aircraft. Aside from the fact that it was built with a shoot-down radar, there are no more positive things left to say about this aircraft, so let us talk about the negative things that made it an epic failure. The MiG-23 was poorly designed. All the pilots who tried to fly this aircraft had a tough time because they had barely had a clear view from the inside, and the seat where they got to stay was tiny. Knowing this information, it was not surprising anymore to know that the pilots simply chose to fly the older versions of the aircraft rather than flying the MiG-23.
The Yak-42
The Yakovlev Yak-42, or merely the Yak-42, is a passenger-jet that has a total of 100 seats. It was built with three massive engines. Well, this aircraft has no technical issues at all; however, a lot of problems could be pointed out from the way its structure was designed. First, the door, where the passengers were supposed to enter, is so small. Another issue has something to do with the stairway at the back of the aircraft – every time a person would walk on it, it would shake and rattle terrifyingly. Another flaw would be the seats – it is terrifying to sit on them because a passenger shared his experience and said that it felt like his seat would fold at any moment.