The Saab 340
Though this Swedish-built plane is still in service today, people say that it is the noisiest and one of the most uncomfortable planes in history. BuckeyeFanFlyer said on FlyerTalk, “I flew the Saab-340 last week for the first time…I could not believe the loud noise of the engine, yes I was sitting right next [to] it. Might think about having earplugs available.”
The MD-80
Believe it or not, the MD-80 had so many issues that even the New York Times wrote about them! Not only was it involved in many crashes that killed passengers, but it was also slow, inefficient, and had barely any personal space. Believe it or not, American Airlines and Delta both still fly these planes!