Firearm-Free Airport Act - Makes it unlawful for all but specified authorized individuals to possess a firearm at a commercial airport in any area in a terminal building, in any area adjacent to the sterile area, in an airfield, or in any building that opens on to an airfield.
Prescribes criminal penalties for nonauthorized individuals who violate such prohibition.
Directs the Secretary of Transportation to ensure that signs warning passengers of such prohibition are posted in airport terminal buildings and other such areas.