Hi everyone, and thank you in advance!

I have always collected Delta Skymiles for travel, even though the flights themselves are often on Air France. I have Platinum status on Delta and would like to keep it.

Now of course all that matters now is spending (I use the Delta SkyMiles Reserve Amex). So when I am flying internationally on Air France flights (or even Delta flights for that matter), should I start using my Flying Blue account for the miles themselves?

I feel a bit thick that I can't figure this out, so I'm grateful for the advice....