Originally Posted by caseynshan
According to this.... NWA never expire?
http://www.nwa.com/worldperks/memrules/general.shtml
"WorldPerks miles have no expiration date. However, consistent with the general terms and conditions of the WorldPerks program, Northwest Airlines reserves the right to change the WorldPerks program at any time without notice, including imposition of expiration limits or reactivation fees. If no mileage from any source is posted to a WorldPerks member's account for three consecutive years, the account is subject to termination, including forfeiture of all accrued mileage. "
They don't expire, but NW can terminate your account and forfeit all of your miles with no activity after three years. While they may not exercise this right, I think that the possibility of that expiration-like action taking place after three years should be noted.