Originally Posted by
LochAwe
You can expect not to get TSA Pre-check on your boarding passes if you book through BA.
But once you get through security, you can also get into the AA lounges, and if you're in Business or First, usually free drinks & food, IIRC.
Definitely not true wrt TSA. I even got TSA Pre ex London last week on a codeshare though I’m not sure what that achieved