The Utilikey looks cool, and probably would get past airline security 999 times out of 100, but seriously... are you completely bonkers? *IF* you *DO* get 'caught' (at least in the UK) you are probably going to be arrested under anti-terrorist laws which could see you sent to jail for a loooong time. (And if you think I'm exaggerating the overreactiveness of the UK police, try Googling "Paul Chambers" and "Robin Hood Airport".)