Originally Posted by GUWonder
For some reason, if BA touches my boarding passes, it's far more likely that "anything" can happen in terms of where the miles do or do not go.
What's printed (or not printed) on the boarding pass has not been a guarantee that the miles credit correctly (or don't credit per my desired account/timing).
I can corroborate this. Once the BA number has touched the record, it seems to be "sticky" and overrides my AA number on the boarding card.