Originally Posted by
SimonsMiles
Marriott, on the other hand, managed to lose all of my points at the end of last year, and since I had no physical proof of them I had to start from scratch
I flew to the states recently on American, and got no miles at all (I didn't realise until it was too late).
Not an answer to your question, but here are two tips:
1. Periodically do a printout from the web page of each program, showing your account info/points. And, in particular, do that at the end of Dec. each year.
2. Always keep your boarding passes. If you still have the AA BP's you can fax them in and get credit. Even if you don't have them, if you have the ticket number and flight numbers, you may be able to get the credit. Login to the website, from the side menu choose AAdvantage/Request Mileage Credit.