But Mr. TSO, it is VERY relevant to your job. Especially for those with the 48 Hour Phoenix University Psychiatrist PhDs known as BDOs, the Boyz from Bandung (look it up ). Who look for "signs" that "you might be a tewwowist." Your safety and my safety might depend on your awareness of airport codes. Example:

Normal looking dude in a smurf blue shirt and black pants just like yours comes thru your TDC Blacklight Stand, and his carry on has one of those cute airport gift shop luggage tags. "I <heart> DEA". He hands you a local driver license for ID=Security™. In one second you must decide:

A. You nod and pass him, with a smile from one of the "Front Line in the Waw on Tewwow", to an obvious supporter of fellow badged agents in the "Front Line in the Waw on Dwugs"

B. You instantly SSSS him, tell your fellows to "give him the works", and silently call over LEO for backup just in case.

Time's up.

Correct answer is B. He bought his tag at the gift shop in one of his favorite frequent airports. On his way to visit OBL. For training.

You don't have to open a passport to see the history of someone's travels, it is often right there out in the open on his bag IF YOU KNOW THE CODE when seeing old stickers, even on checked bags you screen. If his tag says "CJL", be afraid, be very afraid, shoot first, ask questions later. If it says "KHI", either be afraid, or ask him if his "AI" rubbed off.