United Airlines Flight 175 Timeline

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  • (6:45 - 6:52 a.m.) September 11, 2001: Arriving at the airport


  • (Shortly before 7 a.m.) September 11, 2001: Checking in


  • (7:23 - 7:28 a.m.) September 11, 2001: Boarding Flight 175


  • (7:58 - 8:14 a.m.) September 11, 2001: Flight 175 departs


  • (8:19 a.m.) September 11, 2001: First contact with Boston Center


  • (8:33 a.m.) September 11, 2001: Reaches cruising altitude


  • (8:37 a.m.) September 11, 2001: Asked to look for Flight 11


  • (8:38 a.m.) September 11, 2001: Spots Flight 11


  • (8:41 a.m.) September 11, 2001: Reports "suspicious transmission"



  • (8:42 - 8:46 a.m.) September 11, 2001: Hijacking begins


  • (8:46 a.m.) September 11, 2001: Transponder code changes



  • (8:50 a.m.) September 11, 2001: WTC fire reported to ATC


  • (8:51 a.m.) September 11, 2001: Altitude change


  • (8:52 a.m.) September 11, 2001: Calls report hijacking on Flight 175




  • (8:53 - 9:03 a.m.) September 11, 2001: NORAD fighter scrambled


  • (8:55 a.m.) September 11, 2001: Flight 175 suspected hijacked


  • (8:57 a.m.) September 11, 2001: Flight 175 heads for New York


  • (8:58 a.m.) September 11, 2001: Hijack suspicions spread


  • (8:59 a.m.) September 11, 2001: Suspected hijacking reported to United Airlines Chicago


  • (9:00 approx a.m.) September 11, 2001: Flight 175 missing from radar


  • (9:00 a.m.) September 11, 2001: More calls from the plane


  • (9:01 / 9:02): New York Center report to the FAA


<mp3>FAA on Flight 175 Approach.mp3|Download</mp3> - Discussions on the approach of Flight 175

  • (9:02:57 / 9:03:11 a.m.) September 11, 2001: Flight 175 crashes


While the Commission recorded an impact time of 9:03:11, NIST used a time of 9:02:57 based on seismic records. The difference has been used to suggest the seismic readings actually recorded a pre-impact explosion in the basement, however that doesn't stand up to scrutiny. Read more here.

  • (9:03 a.m.) September 11, 2001: NEADS receive notification of a second possible hijack


  • (9:03:22 a.m.) September 11, 2001: A crash at the WTC is confirmed


  • (9:04 a.m.) September 11, 2001: Boston Center stops departures


  • (9:04 - 9:07 a.m.) September 11, 2001: NEADS request information on Flight 175


  • (9:05 a.m.) September 11, 2001: Suspicion of multiple hijacks


  • (9:07 a.m.) September 11, 2001: Aircraft alerted to heighten security


  • (9:08 a.m.) September 11, 2001: NEADS learns of the second WTC explosion


<mp3>NEADS on fighters over NY.mp3|download</mp3>- NEADS mission crew commander

  • (9:09 a.m.) September 11, 2001: Langley fighters ordered to battle stations


  • (9:09 - 9:10 a.m.) September 11, 2001: Boston Center warns aircraft within its region


  • (9:10 - 9:20 a.m.) September 11, 2001: United and American Airlines confer


  • (9:12 a.m.) September 11, 2001: United Airlines staff alerted


  • (9:13 a.m.) September 11, 2001: Otis fighters exit holding pattern


  • (9:15 a.m. approx) September 11, 2001: Request to alert aircraft nationwide


  • (9:19 a.m.) September 11, 2001: ACARS alerts sent


  • (9:20 a.m.) September 11, 2001: UAL believe second crash was Flight 175


  • (9:22 a.m.) September 11, 2001: UAL crisis center activated


  • (9:23 a.m.) September 11, 2001: Cockpit intrusion warning sent to Flight 175


  • (9:25 a.m.) September 11, 2001: Fighter establish combat air patrol over Manhattan