Join Date: Aug 1999
Location: Alexandria, VA, USA NW Platinum Elite Since 1999, United GoldMM, Hyatt Discoverist, SPG Gold, Hilton Diamond, Hertz #1 Gold, IC Ambassador
Posts: 7,451
It has to do with fare, whether there is a meal served on the flight, whether you got upgraded to FC, etc. Mainly perks for the high-rev flyers, although I've had several Y-base fares this year, I've never gotten the coupons.