Originally Posted by
barit1
Sunamer:
Huh? High-bypass engines? INS? A spot of Whitcomb's area rule too?
That must be the reason DC-10 outsold rival TriStar 2:1.

You are correct that was the reason. The Tristar had far more redundancy built into the airframe. It was a lot safer. It also had a higher empty weight with those extras. Payload and revenue generation tops safety every time in the airline business.