It's a hard, sometimes costly lesson, but one we learned over 20 years ago when Travelocity first started doing business. We booked a flight through them and had difficulties checking in when we got to the airport. Problem was eventually solved but it was a bit nerve wracking and we almost missed our flight (that was in the days before 9/11 and all the TSA security hassles). Anyway, decided then and there NEVER to use a third party site when making/booking any type of travel arrangements. We ALWAYS deal directly with the airline, hotel rental car company, etc. We sometimes check the travel websites for pricing but usually find we get the same or better pricing when dealing directly with the vendor.