Did you book and pay for your flight over the internet? I ask because we originally "reserved" through our travel agent in April(Pkg. $$$ better). In June we decided to extend three days. No problem or price increase. Then yesterday I ran the agencies web site and found that US Air is having a sale on flights to the Caribbean. Stopped at the travel agent..she recalculated and we saved $452 on our package. Our $$$ for the trip needed to be paid by June 4 anyways so needless to say I handed over the credit card to secure the new price. Maybe it was because we had not purchased the tickets and only had reservations. Maybe because we were booked through a travel agent. Anyways, hope this helps and doesn't make you feel worse. Remember it for next time anyways.