[firewolf34]

Storing photos of people is a bit of a can of worms, make it even easier and just ask for ID if this error occurs.

[throwaway35777]

That's true, but you'd still need to find the unauthorized passenger already on board. Without a picture you'd have to flush the plane and reboard.

Given there are thousands of security cameras in an airport, I don't think anyone would mind if one was used to record who got on the plane.