AirScrip are coupons for dollars off tickets from the major airlines that were awarded back a few years ago as settlement for a class action suit against the airlines for price fixing.

The coupons can be used for 10% off the purchase of a ticket on any of the airlines in the settlement.

Off the top of my head, the airlines were AA, DL, UA, TW, US, NW, and AW, though I could be forgetting one or have one too many ...

Too get the award you had to fill out a form and mail it in saying how many flights you had took and such over a specified period of time. If you claimed a lot of flights, you had to send in documentation (like DJLawman), if you claimed a modest number of flights, you just wrote it down and mailed it in (like I did). I think I got something like $80 in AirScrip for a modest amount of travel I did during college.