Looking for a bit of thread drift what airlines had the most types at one time?
1974, BA, probably 707, 747, VC-10 from BOAC, Trident, Vanguard, Viscount, Herald, Heron, 1-11's on the BEA side, and the Tristar coming in, perhaps more (10 types so far).
I'm sure though plenty of others operated more. It's a difficult question
