Per two FlyerTalk Evangelists
"AA's system will never auto-cancel a fully ticketed reservation, period. You could have 6 different overlapping reservations on the exact same day and as long as all of them are fully ticketed (not on hold) then nothing would happen to them."
That's the part I cannot believe based on other reports. Cancelling a HOLD sure, but a fully booked with BP ticket is beyond comprehension.