Just a public service reminder for those with expiring BX certs.
I had a BXP3 expiring at end of year, but no use for it. Figuring that it doesn't hurt to ask, so I called AA about it. Found out that you can redeposit cert for $150 fee by mailing it back before expiration. The points will be redeposited into the account and are valid as new points. The fee for additional cert redeposit is $25.
For bigger value certs like the 3100 points BXP3, it could be a good value to pay the fee and have the points available for another 2-3 years. Call AA for the address and be sure to send it before expiration. They are supposed to contact you after receipt to pay the reinstatement fee.