My wife was on a plane years ago when she saw one of the engines on fire. They had departed from JFK and were over the Atlantic on their way to Heathrow. Both engines were out on one side, but they were able to turn back to JFK. Things like that don't upset my wife too much and she went back to sleep, but only after some of the others stopped their unnecessary screaming. She was confident in the pilots and the ability of planes to fly without some engines. Although, the landing was interesting with quite a tilt. The one wing was really fried, so the trucks were there to spray the foam all over as soon as they landed.