The Yak-42
This aircraft has no technical problems; however, some problems can be noticed from the design of its construction. But according to an article, The Yak-42’s design was so horrible, that it is unbelievable that it was still being used in 2013. According to Sir Halffast, it was a misfortune for him to be able to fly in one. The entry door and the seats were terrible, and the stairway seemed like it would pop at any moment.

The Yak-42