Originally Posted by diburning

I think it also depends on whether the airport restaurant (especially the fast food places) are run by a airport concessions company (like OTG, HMS Host, or Delaware North). Often times, these large companies will install their own POS systems as a cost saving measure (and so that front end employees at one restaurant can fill in for employees at another restaurant), and they probably don't have a button for these types of discounts/coupons.