It appears as though Air France-KLM Flying Blue and Singapore Airlines Krisflyer are new American Express Membership Rewards transfer partners.
They show up on the list, anyway, though when clicking for more details you get
- The reward you requested is currently unavailable.
So I imagine this is coming soon.
Good news indeed that American Express seems to be adding partners after losing so many over the past several years. Alas, Singapore is a Star Alliance carrier and there are already others in the program, and Air France KLM is Skyteam adding to that alliance’s already heavy representation. A oneworld partner would sure be nice!