The Justice Department is investigating possible collusion among major airlines to limit available seats, which keeps airfares high.
The websites said they are concerned that search results will draw travelers away from their sites.
Most people use them, the travel sites that promise the cheapest airfare. But is surfing the web and going site to site really worth the effort?
Travelers can expect to pay higher prices this summer, as airlines are offering fewer airfare discounts.
Airline ticket prices are expected to go up this holiday season. Theresa Stewart with Hawaiian Airlines at Mineta San Jose International says she expects their flights to Honolulu will continue to be full, even if fares go up an average of 17 percent nationwide.