It turns out that my SIL (no status, no AC membership) will be flying AA the same morning BOS-DFW, but her flight departs 1 hour after mine.
Under the AC rules, she'll need to leave the club when you do, since guests must be "accompanied" at all times.
I'll be at BOS AC before she arrives. When she arrives, can I have her meet me at the AC entrance and then guest her in? Or does she have to enter the AC at the same time I enter? Will the agents check her BP and refuse to let her in b/c she's not flying on the same itin as me?
Have her call you as she steps off the jetbridge and you can meet her at the front door of the AC. The agents won't look at her BP if you introduce her as your guest.