I would be very cautious of taking advantage of this offer if your sole purpose is to insure a $100 savings on your summer vacation. The main reason I feel this way is that if you wait until June, as the promotion states is the way it works, to purchase an airline ticket for summer travel to a popular destination, it is quite possible that the airfare will be higher by that time than if you purchase your ticket over the next two months. Or what if another carrier is offering a lower price to your destination than Expedia is offering through American Airlines?