You can use this anytime as much as you want: 1str passenger full fare, 2nd 50% off. Good at all locations w/24 adv rsvrtn. Book online or call 800-258-3826. This might be especially helpful for those looking for shuttle from DEN .a/port to dwntwn to try to save $, but it's good anywhere. The coupon code, an entertainment coupon is: FLT95.