Originally Posted by
bocastephen
They can already pull that quite easily after getting your name, credit card and other information from the PNR. Don't assume they're not already accessing that data.
I am certain that they are - and they can get all that other information with a fairly simple process, without my need to give it to them.
But just like I have to bring a document to DMV to "prove" my SSN (even though they can and do check it electronically), I can see TSA requiring us to give it to them "just because" (it makes their life easier). And from their perspective, it also gives them another "proof" to turn you over to LE for providing false info to the government. Bury 'em (us) with paperwork and at some point they'll (we'll) screw up.