AMEX has added the ability to transfer Membership Rewards points to Avianca Lifemiles, a Star Alliance airline. You can transfer points at a 1k:1K ratio.
Lifemiles is one of the rare mileage programs that doesn’t collect any fuel surcharges. United is another program that does not collect fuel surcharges, but AMEX points can’t be transferred to United as they are exclusively with Chase.
Points transfer instantly from AMEX to Lifemiles.