When is a gift not a gift?

When you accept a $300 voucher for airline travel but you find out when you get to the other carrier that your orig. carrier did not follow through. Your new flight is totally booked. Now you must change terminals, go through security again, & wait 3 hrs. for a new flight. Will we think of this experience the next time we are on the verge of being bumped and are seduced by a $300 promise? You betcha!