While I don't think there is a technical defination, it's generally applied to any flight (mostly longhauls) that flies at night and arrives in the morning. I've heard the term used around the world and not just for the transcon flights.
I remember flying UA from IAD to LAX on a redeye. First class was full and there were 3 people in coach, including me. The FA's just told us to go in back if we needed anything.
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America- Where we privatize gains and socialize loses
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