DALLAS (AP) — As a Delta Air Lines jet began roaring down a runway, an air traffic controller at New York's John F. Kennedy International Airport suddenly blurted out an expletive, then ordered the pilots to stop their takeoff roll. The controller saw an American Airlines plane mistakenly crossing the same runway, into the path of the accelerating Delta jet. JFK is one of only 35 U.S. airports with the equipment to track planes and vehicles on the ground.