American Express Membership Rewards - MR into AAdvantage

In your experience, what's the best way to get this done?

Thanks, trying to book a gift ticket for brother-in-law's honeymoon and am a few AA miles short.

Darn! Since your title didn't have a question mark on it, I thought you were going to tell me how to do this.

I have heard that AMEX and AA had some major fight and so do not co-operate. If you wish you can transfer to Mexicana and redeem on AA.