A year ago Citibank added Avianca’s LifeMiles as a points transfer partner. Now American Express Membership Rewards has done so as well.
LifeMiles is a fantastic Star Alliance program. I have a few hundred thousand of their miles, and I’ve never used them to travel on Avianca. Instead I use them for premium cabin awards on airlines like Lufthansa, Asiana, and Thai Airways. And I use their cash and points awards to book United’s domestic first class.