Wonder what would *really* happen in an emergency - say, on a flight to Orlando from Heathrow. How many "smaller" lifejackets do you suppose they have, taking into account the gaggles of children on such a route and, during a water landing, is someone really oepning the overheads looking for them and ensuring they get to the kids? Maybe they have them by the fore-doors, and can ahdn them out on exiting, but that would ***** the people using the overwing exits (I think I am right that rear doors are not opened in a water-landing situation) I'm guessing age 10 or so up could make the adult one fit, smaller than that, I don't think it would.