25th Anniversary Timeline WTC 2001 : 8:51 am : A flight controller at the FAA’s New York Center notices that Flight 175 had changed its transponder code twice four minutes earlier; he tries to contact the flight.

Another flight in the area, Delta Air Lines flight 1489, reports the sight of smoke coming from lower Manhattan to New York Center. This is the first word any pilots in flight receive of the incident. –

25th Anniversary Timeline WTC 2001 : 8:51 am : A flight controller at the FAA’s New York Center notices that Flight 175 had changed its transponder code twice four minutes earlier; he tries to contact the flight.

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