Refreshing this thread and wanted to give a heads up as we enter this holiday travel rush season - check your MP account to make sure your Known Traveler Number/Pass ID (PreCheck) info and passport are in your account!

FWIW, just got back from a day trip - hadn't noticed that I didn't have PreCheck when I printed my boarding passes. Was sent through the Premier line @ LAX which was much shorter than the PreCheck line...

Anyway, I tried to check my MP account profile via smartphone but UA has not enabled that. Finally back in town this evening and got on to a PC - my Known Traveler Number/Pass ID was wiped away from my account as was my passport info. So, I've just re-entered them and the info appears to be sticking.

A friendly suggestion to check so you can PreCheck!

David