Sometimres you really have to play around with dates, day of week, etc. I suppose that the destination also has something to do with it. I know that when I booked air/hotel/car package to Maui last year through DeltaVacations, the same thing was $1,000 - 1,500 more on AA and UA. And it was much better than I could do booking everything separately - - maybe I just got lucky!