BOAC, Thanks. RE. 1) No, I realise most passengers would not know the important distinction between 'departure' and 'take-off' in official comms terms. I was just wondering whether 'departure' is used in internal PAs (Ryanair uses the command 'Cabin Crew: Seats for Departure', for example) for the same reason: to avoid anyone overhearing the radio mistaking a reference to a take-off in twenty minutes for an imminent one.