later at 08:51.[2] Unlike Flight 11, which had turned its transponder off, Flight 175's flight data could still be properly monitored.[14] Also, at 08:51, Flight 175 changed altitude. Over the next three minutes, the controller made five unsuccessful attempts to contact Flight 175 and worked to move other aircraft in the vicinity away from Flight 175.[2]

At around this time, the flight had a near midair collision with Delta Air Lines Flight 2315, reportedly missing the plane by only 300 feet, as air traffic controller Dave Bottiglia frantically tried to tell the Delta pilot to take evasive action. Bottiglia was the first person in the control center to realize that Flight 175 was hijacked when he gave directions for a turn. Flight 175 did not respond, instead accelerating andheading toward the Delta plane. The controller commanded the Delta pilot, "Take any evasive action necessary. We have an airplane that we don't know what he's doing. Any action at all."[15][16] Moments before Flight 175 crashed, it avoided another near collision with Midwest Express Flight 7, which was flying from Milwaukee to New York.[17]

At 08:55, a supervisor at the New York Air Traffic Control Center notified the center's operations manager of the Flight 175 hijacking, and David Bottiglia, who was handling both Flight 11 and Flight 175, noted, "we might have a hijack over here, two of them."[2] At 08:58, the plane was over New Jersey at 28,500 feet, heading toward New York City. In the five minutes from approximately 08:58 when Shehhi completed the final turn toward