Received $12,449.40 from American Airline Pension how can i tell if this RMD money? What form should I receive to show the RMD amount?

[DoninGA]

Pension payments reported to you on a Form 1099-R are all an RMD.  So where asked indicate the entire payment was an RMD.

[JulieS]

If you receive retirement benefits from your pension, the payment is your Required Minimum Distribution (RMD) for the account. 

Because pension trustees are required to follow RMD rules, you can assume your pension is an RMD and the entire RMD was made for this account.