Originally Posted by
ethernal
(while I don't advocate it, it would almost be nice of the TSA boarding pass scanners fed into the airline's system - if they haven't cleared security at T-15, they can be safely bumped from the flight).
FWIW, they have this at LHR (not sure if it's specific to BA or an overall BAA thing), it's called Flight Conformance. And they have it for connecting pax too. If you're not scanned in by the cutoff (forget exactly what it is, T-30 maybe?) you're offloaded from the flight. For pax, I think it has more drawbacks than benefits, but I guess it's favorable for the airline...