This is what I got. Tried to register my wife and kidds, but not available for them.

Register before 26 April for the Flying Blue Miles Booster offer. You could earn up to 7,000 additional
Award Miles on flights taken with AIR FRANCE or KLM between 1 May and 31 July 2015. Simply click
above to register.



Take 2 flights to earn a bonus of
2,000 AWARD MILES
+
Take 2 additional flights to earn
an additional bonus of
2,000 AWARD MILES
+
Take 1 additional flight to earn
an additional bonus of
3,000 AWARD MILES
=
7,000
AWARD MILES
TO EARN FOR 5 FLIGHTS