I find Travelocity to usually be the most expensive search engine. Go with Kayak.com and it will search everything at the same time: All the airlines' sites, Expedia, Travelocity, Orbitz, Priceline, Mobissimo, and more. Sometimes AA is not searched, though, and some LCC's.
It really doesn't help that you have to fly from the top left corner of the continent (ANC) to your base in the bottom left corner of the continent (LAX) to find your way to the bottom right corner of the continent (MIA) to fly another leg to where you live....Just about the worst case I've heard.