Okay, this works every time! Always make sure they are walking away from the gate unless you want to waste your time, although if I know I'm a passenger on their ride, it makes it more fun!
"Excuse me Mr. Pilot Sir, I just noticed something astounding! Could I see your hand for a sec?"
Then, making sure that you take the left hand (checking for ring or signs of the ring that was there before they left home , if you care), hold your hand up to compare sizes. Then, batting your oh-so-lovely eyes (green in my case), exclaim:
"Oh my! Your hands really are huge! You know that the old saying about the size of a man's feet, don't you? Well, it's actually his hands...
Then, depending upon how much you want this guy, how horny you are, and how much time you have, it's always fun to add:
"Which is so much better, I hate getting out of bed and tripping over big shoes! Besides, small hands can't hold much (which, I don't know about yours, but when I make the comment, I've got the 'girls' to back it up).