Concur entirely with Sikeano,
smile sweetly, let them carry out the job they are forced to do, remember that the vast majority of them are on the minimum wage and aren't little Hitlers - just doing an impossible job working to impossible directives, working for impossible management.
More importantly, remember that when you've got through the Security checkpoint, after being delayed by 5 mins or less, they'll still be in there earning **** all and you'll be out there earning significantly more and having a much better working life.