If you have a specific redemption in mind with AirFrance, you may be interested in this 25% bonus when transferring American Express Membership Rewards points into Flying Blue Miles. You need to log into your account to see the transfer bonus.
25% Bonus Transferring Amex MR Points To Flying Blue Miles
Examples of Amex Cards that earn Membership Rewards points:
Check this out if you are heavy in MR points and have a specific redemption in mind for AirFrance.