Does anyone recall what seat pitches used to be in coach class before 1980, that is before de-regulation, before non-refundable tickets, before all those different booking class letters, before male flight attendants?

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If I recall, there were just two classes back then, F for first and Y for coach. OK there was also K for economy on some flights and the rear cabin was mixed Y and K. On some flights (including United) the main difference at one time between Y and K was that no meals were served for K passengers, the latter could sometimes buy a box lunch to carry on board.