[angkor]

Credit card size for the middle and right. Smaller for the one on the left, goes on the keychain.

Those above are from a company called RSA, very big in computer security. There are other brands, but they'd use the same general form factor, obviously different logos. The devices (they're called tokens), can be tracked right down to individual to whom they were issued.

Easy to drop when rummaging through your pockets or briefcase during flight, or maybe the fob was attached to the computer carryon (like a luggage take) and simply fell off.

[windchime]

"The devices (they're called tokens), can be tracked right down to individual to whom they were issued."

Security should be able to trace and clear the matter up quickly then. It is also reassuring to know they are small and easily dropped because that would explain why it wasn't readily found by the flight attendant or another passenger.

[JustPiper]

Can they be used for anything else? Modified to do harm as such?