Oh! the evil of all roots http://www.itnews.com.au/News/381803,hacker-holds-key-to-free-flights.aspx
... Passengers with phony passes in hand only run the risk that the aircraft they intend to board may be fully booked, the hacker said. "Currently, if you get into a completely booked flight and you have no place to sit, it will obviously be detected," he said.