I don't want to give out incorrect info, so I'll have to say that I'm not sure about this particular GC, but in general AA CTO's are pretty lenient about combining "bumping" and refund vouchers with coupons and discounts (I've used both kinds of vouchers with the Entertainment coupons in the past). Perhaps a phone call to AA promos (1-800-433-1790) may clear up any doubt.