Kind of interesting how that works.

There's nothing on the checkpoint signage that indicates it's only for domestic itineraries. I don't recall anything in the airline emails about that either.

A couple months ago, at SEA (again, sigh). At that time, Pre-check and elite lanes were side by side, led to two side-by-side TDCs. I'm in the elite lane, no one at the pre-check TDC, so she motions me to step up. She checks my BP/DL, then says 'Pre-check is only eligible for domestic itineraries'.

Mildly annoying because 1) Her manner was downright snotty, 2) She summoned me to her podium (five or six feet from the 'elite' podium, so it should have been clear to her that I wasn't claiming Pre-check eligibility and 3) no airport signage and none of the various emails I received ever mentioned the domestic flight restriction, so why would she assume I should know it? (I do, but only because of FT).