Nothing was safe in their path. A New York Center controller watched as the United plane turned toward a Delta 737 flying southwest at 28,000 feet. “Traffic two o’clock! Ten miles,” the controller warned the Delta pilots. “I think he’s been hijacked. I don’t know his intentions. Take any evasive action necessary.” The Delta flight ducked away from United 175, but soon after, the hijacked plane put itself on a collision course with a US Airways flight. An alarm sounded in the US Airways cockpit, and the pilots dived to avoid a midair crash.
