The nation’s airlines say a new government...

The nation’s airlines say a new government investigation of schedule-related delays at four more major U.S. airports misses the real cause of late flights. The basic problem, say airline representatives, is that the airport and air traffic control system cannot meet the demands of growing air traffic. The Department of Transportation said it will study airline scheduling at Denver’s Stapleton International Airport, Newark International Airport in New Jersey, New York’s LaGuardia International Airport and San Francisco International Airport. “DOT’s ongoing investigation is an effort to distract consumer attention from the government’s failure to improve the air traffic control system and nothing more,” said Clark Onstead, a vice president of Texas Air Corp. “It’s a clever (public relations) ploy.”