41. Drink Coupons – drink coupons, most notably of the Southwest Airlines variety, entitle the user to one alcoholic beverage of their choice on a flight.
While airlines try to prevent them from being bought or sold (and it is a violation of the terms on the coupon), that has not stopped them from being traded as clearly they are something of value.
Some business travelers with many coupons have generated a decent side income by selling the coupons. For buyers, if you can get a drink worth $7 by buying someone’s drink coupon for $3 online, the deal makes sense.