[he's going to move on from that, not wishing to get into an argument over semantics such as that. and anyway, if she'd look around and notice things, she'd realise they were very much NOT on a plane at all]

[shrugs very nonchalantly] I just guessed. You never looked at someone and thought, "Blimey...that bloke looks like a Bob. Maybe a Tom, but definitely a Bob."?