Flyet var af typen [[Boeing 757|Boeing 757-222]] og havde [[Nationale kendingsbogstaver (fly)|registreringsnummeret]] N591UA.<ref name="ntsb-fps">{{cite web |url=http://www.ntsb.gov/info/Flight%20_Path_%20Study_UA93.pdf |format=PDF|title=Flight Path Study - United Airlines Flight 93 |date=2002-02-19 |publisher=[[National Transportation Safety Board]] |access-date=2008-08-24}}</ref> Det havde plads til 182 passagerer, men den 11. september 2001 var der kun 37 passagerer (inklusiv de fire kaprere) samt syv besætningsmedlemmer om bord, hvilket svarer til en belægning på 20 procent.<ref name="Staff">{{cite web |url=http://www.archives.gov/legislative/research/9-11/staff-report-sept2005.pdf |title=Staff Report – "We Have Some Planes": The Four Flights — a Chronology |format=PDF |publisher=[[9/11 Commission|National Commission on Terrorist Attacks Upon the United States]] |access-date=2008-06-21 |archive-date=24. februar 2011 |archive-url=https://web.archive.org/web/20110224212947/http://www.archives.gov/legislative/research/9-11/staff-report-sept2005.pdf |url-status=dead }}</ref> De syv besætningsmedlemmer om bord var [[Kaptajn (transport)|kaptajnen]] Jason Dahl, andenpiloten LeRoy Homer, Jr. samt kabinepersonalet bestående af Lorraine Bay, Sandra Bradshaw, Wanda Green, CeeCee Lyles og Deborah Welsh.<ref>{{cite web |title=People killed in plane attacks |url=http://www.usatoday.com/news/nation/2001/09/11/victims-list.htm |date=2001-09-25 |work=[[USA Today]] |access-date=2008-08-24}}</ref>
Historie