TSA will refuse to let passengers into the "secure area" if they refuse to show their id.
But not if they've "forgotten or lost" it.
http://www.tsa.gov/press/happenings/enhance_id_requirements.shtm This is not security. Anyone who says so is lying. This is fascism. This is about power.
Say goodbye to your court appeal okayed right to travel without id.
http://www.schneier.com/blog/archives/2008/06/new_tsa_id_requ.html