I have a flight out of DCA on AA and want to see if I can use the UA Club Lounge in B. From my understanding, the piers are not connected airside. So if I want to use the UA Club, will TSA have a problem with entering the B South piers to use the UA Club with an AA boarding pass? I suspect with TSA Pre check, re-clearing security at the C North pier shouldn't take too long after using the UA Club Lounge.