Thanks for all the replies.

Guess I'll need to call. I am not exactly a straightforward case: not a US FFP member, but traveling with my British Airways card. Not a US Citizen either, but since some time foreigners with GE are also entitled to use TSA Pre. And for some reason my (repatedly extremely stupid) travel agent has put my ticket together with a separate BA ticket under one and the same PNR, which may mix up things even more.

I'll try and report back.

Thanks again for all the hints.