BobDDuck
Island Bus Driver
Except security cameras. Oh, and when you go through TSA, if you already have your seat request card, the TSA person who checked your ID will stamp or sign it to prove it was checked so you can just keep that and use it as proof if you are ever questioned.
Not to mention a lot of airlines are now supplying TSA with access to the database that houses the ticketing info. If you fly on one of those carriers, when you go through the checkpoint you scan your boarding pass and then the TSA agent verifies it's a valid flight (for that day) and that your ID matches your ticket. It also tags your reservation with the time and location you went through the checkpoint.