View from the Wing points out that through February 29 you can get a 25% bonus for transferring Membership Rewards points to Flying Blue (Air France & KLM frequent flyer program).
You may initially think this is a good idea because of their seemingly great mileage sales that, for example, currently allow you to get a round trip ticket to Europe for 25,000 miles (or only 20,000 Membership Rewards points). That’s true, but they also charge $570 in taxes and fuel surcharges on that “free” ticket, making it pretty much worthless.
However, they DO NOT charge fuel surcharges when you book a flight on Delta. True, you cannot take advantage of the ridiculous 25k round trip deal, but Flying Blue only charges 50,000 miles for a round trip ticket to Europe (instead of 60,000 with Skymiles), so it would only cost you 40,000 Membership Rewards points for a trip to Europe in coach, with no added fuel surcharges.
I definitely wouldn’t transfer points for the 25k round trip deal – the fuel surcharges make that ridiculous. And if you want to fly Air France or KLM, use your Delta miles, as they do not charge fuel surcharges (and availability is usually pretty good). But if you’re going to fly Delta, Flying Blue is a great way to take advantage while using fewer miles.