None. TSA has no right to your medical records. All you have to tell them is the nature of the accommodation you want.

That includes me. I can walk but have very poor lower body endurance. So I walk with a stick (or two), and use wheelchairs where possible.

Justifying any of that is not, IMO, appropriate for anything short of my doctors or possibly stuff like an SSDI claim. If I say I can't walk far enough, that's that.

Disabilities can be temporary. What if you sprained your ankle the previous day, it'll heal on its own, you've not gone to the doctor, but you still need to reduce your time on your feet? I think that 100% justifies use of an airport wheelchair and cutting long lines (or at least being allowed to sit while waiting — remember that long lines isn't just a question of how fast you get there, but having to stand the whole time; even the DMV generally manages to do better than that).

Was it actually a TSO, not someone from the airport? TSA has claimed: "Priority lanes are managed by the airlines. We don’t regulate or endorse this practice."

They also usually claim that their area only starts at the TDC. Then again, they also have stuff saying that eg BDOs are supposed to "walk the line", starting with the beginning of the line, which is a strange thing to do in an area you supposedly have nothing to do with.

And if anyone from TSA is checking the front of the line, let alone determining whether or not someone can use a priority lane (including disabled priority), then that becomes an outright lie.

I'd love to have proof of this, BTW. Pictures or videos of TSA — not airport — personnel managing the beginning of lines (pre TDC) would be very valuable to me.


…

a) You shouldn't have to, though as above
b) ...