Originally Posted by
xliioper
Also, attempting to use one program for benefits while crediting flights to a different program can often have issues (this area is kind of grey and agents have been known to refuse access).
Just crediting is easily solvable - you request credit after flying and leave the ticket without a FF number. I'm more worried for other benefits - like priority for SkyMiles members for free upgrades. It would make it so much easier if they would allow us to switch to Flying Blue and get the same level just as a one time exception and at least for EU residing SkyMiles members.