And if you want an example of who has the power these days, I've encountered airport shops that are "take it leave it" (WHSmith in Spain in fact). I was told th

And if you want an example of who has the power these days, I've encountered airport shops that are "take it leave it" (WHSmith in Spain in fact). I was told they can't require my boarding pass, but they won't sell me anything without it... (There was no language barrier)