“When I’m in no hurry, Delta never overbook”
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I believe, as part of it’s business model, JetBlue does not overbook. I think it’s the only airline that doesn’t.
I used to fly international quite a bit. Because it was company paid, it was Business Class. Delta overbooked Busienss Class quite a bit and as a result (due to my frequest flying), I was bumped up to First Class. I believe I flew International First Class about 6 times. Twice, I was the only person in First Class. It was wonderful!