Possible Clues:

• Pre-flight org
• Org. that offers Precheck enrollment
• Fed. air marshal's org
• Org. that checks what isn't checked
• Group that checks bags at the airport: Abbr
• Airport org. flagging bags
• Org. with a prohibited-items list
• Bag scanning org
• Airport-safety org.
• Org. that makes you take off your shoes