Shortly Before September 11, 2001: More than Half of Attendants on United 93 Are Assigned to It after Not Originally Being Scheduled for This Flight

Of the five flight attendants who will be on United Airlines Flight 93—the fourth hijacked aircraft—on 9/11, at least three are not originally scheduled to be on this flight, but are assigned to it late:
Sandra Bradshaw picks “up Flight 93 late in the planning.” She trades flights with another attendant. [Pittsburgh Post-Gazette, 10/28/2001; Greensboro News-Record, 9/3/2006]
Wanda Green is originally scheduled to fly on September 13, but requests a change of shift due to commitments in her other job as a real estate agent. [Pittsburgh Post-Gazette, 10/28/2001; Longman, 2002, pp. 23]
Deborah Welsh usually avoids early morning flights, but agrees to trade shifts with another worker. [Chicago Tribune, 10/2/2001; Observer, 12/2/2001; Associated Press, 9/9/2006]
The pilot, Jason Dahl, is also not originally meant to be on Flight 93 on September 11, but trades a trip later in the month in order to fly on that day (see Shortly Before September 11, 2001). And at least 16 of the passengers on Flight 93 only book onto it at a late date (see Shortly Before September 11, 2001-Early Morning September 11, 2001). Many of the flight attendants who will be on the other three hijacked planes are also only assigned to those flights shortly before 9/11 (see Shortly Before September 11, 2001-Early Morning September 11, 2001, Shortly Before September 11, 2001, and Shortly Before September 11, 2001-Early Morning September 11, 2001).