Some of the nation’s largest airlines have...

Some of the nation’s largest airlines have an unfair competitive advantage because they own the computer reservation systems that travel agents use to book passengers, a General Accounting Office study says. Congress’ investigative agency concluded that the Transportation Department should try to correct the “anti-competitive features” of the systems, whose owners collect fees from airlines and travel agents. American Airlines’ SABRE system garners 43% of U.S. reservation system revenue; United Airline’s Apollo system, 32%; PARS, owned by Trans World Airlines and Northwest Airlines, 10%; Texas Air Corp.’s System One, 10%, and Delta Airlines’ DATAS II, 5%.