Flights for UA9904 These are not all the flights that UA9904 has taken, just some of them that have flown in or out of SFO

UAL9904 (BFI-SFO)
This United Airlines flight traveled from King County International Airport-Boeing Field to San Francisco International Airport, on August 13, 2009. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9904.
UAL9904 (BFI-SFO)
This United Airlines flight traveled from King County International Airport-Boeing Field to San Francisco International Airport, on July 22, 2010. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9904.
UAL9904 (MDW-SFO)
This United Airlines flight traveled from Chicago Midway International Airport to San Francisco International Airport, on September 20, 2010. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9904.
UAL9904 (MDW-SFO)
This United Airlines flight traveled from Chicago Midway International Airport to San Francisco International Airport, on August 13, 2007. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9904.
UAL9904 (MDW-SFO)
This United Airlines flight traveled from Chicago Midway International Airport to San Francisco International Airport, on August 14, 2008. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9904.
UAL9904 (MDW-SFO)
This United Airlines flight traveled from Chicago Midway International Airport to San Francisco International Airport, on April 08, 2007. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9904.
UAL9904 (ONT-SFO)
This United Airlines flight traveled from Ontario International Airport to San Francisco International Airport, on May 16, 2008. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9904.
UAL9904 (SFO-MDW)
This United Airlines flight traveled from San Francisco International Airport to Chicago Midway International Airport, on May 18, 2008. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9904.
UAL9904 (SNA-SFO)
This United Airlines flight traveled from John Wayne Airport to San Francisco International Airport, on September 13, 2006. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9904.

All these flight data are available as openly licensed data on the sfomuseum-data GitHub account. If you'd like to read more about our efforts to archive flight data at SFO Museum have a look a the Mills Field weblog posts tagged "flightdata".