Spent 4 years flying the -200F, 2400 hours, I personally never shut down an engine on the TriStar. 125,000 LBs cargo, 23 upper deck, I think 13 lower deck? Lots of volume; weight ain't everything! We would go to Hawaii from LA every day. max gross weight , max cargo, and thats a five hour flight time. Straight up to FL350. If you maintain them, (like every other plane) they will be fine! Had the biggest cargo door of any western plane. there is no reason you should not make money if you run it right, and pilot salaries won't sink an airline!