The running debate between American Airlines on one side and online and traditional travel agencies and their technology companies on the other is an important one for air travelers, even if it's hard to understand and connect to your next trip. American wants you to shop more on its own Web site. Many customers don't think that's a good idea. Here is a news article from the trade paper Travel Weekly. and another longer one from Aviation Week that goes into lots of detail.
For a really thorough treatise from the Business Travel Coalition, one of the groups leading opposition to American's efforts, another trade publication gave BTC chairman Kevin Mitchell room to explain it all. Find that here.