Editing United Airlines Flight 93 (section)

===Hijack warnings issued===
The three other hijacked flights all departed within fifteen minutes of their scheduled times. By the time Flight{{spaces}}93 became airborne, Flight 11 was within four minutes of crashing into the North Tower and Flight 175 was being hijacked. The terrorists aboard Flight 77 had not yet made their move, but were nine minutes away from storming the cockpit.<ref name=Wald>{{cite news |last1=Wald |first1=Matthew L |first2=Kevin |last2=Sack |title=A Nation Challenged: The Tapes; 'We Have Some Planes,' Hijacker Said on Sept. 11 |url=https://query.nytimes.com/gst/fullpage.html?res=9A0CE0D81F3FF935A25753C1A9679C8B63 |date=October 16, 2001 |work=The New York Times |access-date=August 24, 2008 |archive-date=January 22, 2020 |archive-url=https://web.archive.org/web/20200122204146/https://www.nytimes.com/2001/10/16/us/a-nation-challenged-the-tapes-we-have-some-planes-hijacker-said-on-sept-11.html |url-status=live}}</ref> By 09:02, less than a minute before Flight 175 hit the South Tower, Flight 93 reached its cruising altitude of {{convert|35000|ft|m}}.<ref name="ntsb-fps"/>

With the attacks unfolding, air traffic officials began issuing warnings through the [[Aircraft Communication Addressing and Reporting System]] (ACARS). Ed Ballinger, the United [[flight dispatcher]], began sending text cockpit warnings to United Airlines flights at 09:19, sixteen minutes after Flight 175's impact. Ballinger was responsible for multiple flights, and he sent the message to Flight{{spaces}}93 at 09:23. Ballinger received a routine ACARS message from Flight{{spaces}}93 at 09:21.<ref name="9/11Commission"/> At 9:22, after learning of the events at the [[World Trade Center (1973–2001)|World Trade Center]], LeRoy Homer's wife, Melody Homer, had an ACARS message sent to her husband in the cockpit asking if he was all right.<ref name="Notes">{{cite book |chapter-url=http://govinfo.library.unt.edu/911/report/911Report_Notes.htm |chapter=Notes |year=2004 |title=9/11 Commission Report |publisher=National Commission on Terrorist Attacks Upon the United States |access-date=May 30, 2008 |archive-date=May 30, 2008 |archive-url=https://web.archive.org/web/20080530161252/http://govinfo.library.unt.edu/911/report/911Report_Notes.htm |url-status=live}}</ref> At 09:24, Flight{{spaces}}93 received Ballinger's ACARS warning, "Beware any cockpit intrusion{{snd}}two a/c [aircraft] hit World Trade Center".<ref name="CNN1">{{cite news |title=Flight 93 hijacker: 'Shall we finish it off?' |url=http://www.cnn.com/2004/US/07/22/911.flight.93/index.html |date=July 23, 2004 |work=CNN |access-date=June 23, 2008 |archive-date=October 29, 2019 |archive-url=https://web.archive.org/web/20191029170609/http://www.cnn.com/2004/US/07/22/911.flight.93/index.html |url-status=live}}</ref> At 9:26, pilot Jason Dahl, apparently puzzled by the message, responded, "Ed, confirm latest mssg plz -- Jason".<ref name="CNN1"/> At 09:27:25, the flight crew responded to routine radio traffic from air traffic control. This was the last communication made by the flight crew before the plane was hijacked.<ref>{{cite web |title=Air Traffic Control Recording |url=https://www.ntsb.gov/doclib/foia/9_11/ATC_Report_UA93.pdf |date=December 21, 2001 |publisher=[[National Transportation Safety Board]] |access-date=August 24, 2008 |archive-date=October 23, 2011 |archive-url=https://web.archive.org/web/20111023121506/https://www.ntsb.gov/doclib/foia/9_11/ATC_Report_UA93.pdf |url-status=live}}</ref>