Miles in your Flying Blue account will expire after 24 months unless you reset the clock. The easiest way to extend the expiration date is to take a qualifying flight on one of their SkyTeam partners which includes Delta Airlines and crediting the miles to Flying Blue (rather than Delta SkyMiles).
How to find the expiration date
- Browse to the Air France website (https://www.airfrance.us).
- In the upper right corner click on My account. A popup login will appear. Enter your email address and password to log in.
- Look at the upper right corner again and it will display your name, status, and number of miles. Click on this again to expand the sub-menu below it and select MY PROFILE.
- Click on LAST TRANSACTION to display more details.
- Under ACTIVITY OVERVIEW you will see how many miles you have and how long they are valid.