Originally Posted by gleff

You can redeem for Starwood certificates not points.

The only programs you can literally transfer points out to are United, Continental, Midwest, and Hilton.

You can transfer points to Midwest and use those miles for American flights. But if you truly must have AA miles, the two possible routes would be:

Amtrak --> Hilton --> American (70% devaluation, IIRC)
Amtrak --> United --> Diners Club --> American (50% devaluation)

You CAN do Amtrak --> United --> Diners Club --> Starwood, but 25k Amtrak points become only 7500 AA miles.