I applied online. The process took 1+ week. I interviewed at FirstLine Transportation Security (Kansas City, MO) in June 2010
Interview
Have a pulse, don't have a criminal record, not a lot of credit debt (Bad debt), high school grad/GED. Can you read? You're hired, monkey! Seriously, they are looking to hire people to facilitate a process. They are more than happy to fire you, so that they can get some other troglodyte in your uniform. So if you're a masochist, apply away.