Originally Posted by
irishguy28
Based on what you've written, you probably should be in a rush.
Simply going on what you've written (a few miles credited to your FB a "couple of years ago") - which of course may not be the most accurate assessment of your account - your miles (or at least a part thereof - that part being all miles present in your FB account prior to, or earned during, your last recorded flight) are likely to expire any moment; FB miles expire 24 months after earning without any subsequent overall-extending activity (i.e. 24 months after your last recorded XP-earning flight).
Flying Blue accounts are NOT a good place to store miles indefinitely, when you fly so infrequently on Skyteam airlines. You should look to use up these miles ASAP, or start to credit the occasional Skyteam flight until such time as you can wind down your account in a beneficial manner.
Those miles from a couple of years ago expired because I actually wanted to have them credit to Delta but made a mistake of booking while logged into AF account. No risks of the bulk of miles expiring since they were transfered recently.
I do fly a lot on Delta/KLM between the US and Europe, but was crediting to Delta. Now that getting status with Delta with cheap economy tickets is very hard, I might credit some flights to FB.