Flights for UA9921 These are not all the flights that UA9921 has taken, just some of them that have flown in or out of SFO

UAL9921 (ORD-SFO)
This United Airlines flight traveled from Chicago O'Hare International Airport to San Francisco International Airport, on October 29, 2010. Passengers were flying aboard a Boeing 747-400. See all the flights for UA9921.
UAL9921 (ORD-SFO)
This United Airlines flight traveled from Chicago O'Hare International Airport to San Francisco International Airport, on April 16, 2011. Passengers were flying aboard a Boeing 757-200. See all the flights for UA9921.
UAL9921 (PHX-SFO)
This United Airlines flight traveled from Sky Harbor International Airport to San Francisco International Airport, on September 05, 2010. Passengers were flying aboard a Boeing 757-200. See all the flights for UA9921.
UAL9921 (PHX-SFO)
This United Airlines flight traveled from Sky Harbor International Airport to San Francisco International Airport, on April 23, 2011. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9921.
UAL9921 (SAN-SFO)
This United Airlines flight traveled from San Diego International Airport to San Francisco International Airport, on February 01, 2011. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9921.
UAL9921 (SAN-SFO)
This United Airlines flight traveled from San Diego International Airport to San Francisco International Airport, on January 10, 2012. Passengers were flying aboard a Boeing 757-200. See all the flights for UA9921.
UAL9921 (SEA-SFO)
This United Airlines flight traveled from Tacoma International Airport to San Francisco International Airport, on November 05, 2010. Passengers were flying aboard a Boeing 757-200. See all the flights for UA9921.
UAL9921 (SEA-SFO)
This United Airlines flight traveled from Tacoma International Airport to San Francisco International Airport, on February 28, 2011. Passengers were flying aboard a Boeing 757-200. See all the flights for UA9921.
UAL9921 (SMF-SFO)
This United Airlines flight traveled from Sacramento International Airport to San Francisco International Airport, on September 17, 2010. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9921.
UAL9921 (SNA-SFO)
This United Airlines flight traveled from John Wayne Airport to San Francisco International Airport, on January 23, 2012. Passengers were flying aboard an Airbus A320-200. See all the flights for UA9921.
UAL9921 (VCV-SFO)
This United Airlines flight traveled from Southern California Logistics Airport to San Francisco International Airport, on September 05, 2011. Passengers were flying aboard a Boeing 767-300. See all the flights for UA9921.
UAL9921 (YVR-SFO)
This United Airlines flight traveled from Vancouver International Airport to San Francisco International Airport, on January 23, 2011. Passengers were flying aboard an Airbus A319. See all the flights for UA9921.