in 1967, we had a project w/united....every sun i did iad-sfo & fri came back....the plane was a stretch dc8, comfortable in back for 6'3", 215 lb guy....
ua would give you a lounge card if you documented flying 100k mi....
circa 1976/7, my boss & i were were at braniff gate at dfw waiting for a delayed flight.....harding lawrence, braniff chairman was also waiting....boss knew him, so we chatted a bit & and he set up both of us w/lounge cards...