I get quite a bit AmEx MR points that I like to use to redeem AA (American) flight from US (NYC) to China (Shanghai). The Air Canada has very high fuel charge (like $350 or more). Both United and Delta require a lot points. Only AA shows good reward tickets.

What airline should I transfer the MR points to first, then book the AA flights? I can do Etihad and Iberia. Not sure about British Airway or Asia Miles.

Any good pointers will be appreciated.