Flights for UA2121 These are not all the flights that UA2121 has taken, just some of them that have flown in or out of SFO

UAL2121 (SFO-KSNA)
This United Airlines flight traveled from San Francisco International Airport to John Wayne Airport, on February 15, 2016. Passengers were flying aboard a Boeing 737-700. See all the flights for UA2121.
UAL2121 (SFO-LAX)
This United Airlines flight traveled from San Francisco International Airport to Los Angeles International Airport, on October 31, 2014. Passengers were flying aboard a Boeing 777-200. See all the flights for UA2121.
UAL2121 (SFO-LAX)
This United Airlines flight traveled from San Francisco International Airport to Los Angeles International Airport, on March 24, 2015. Passengers were flying aboard a Boeing 747-400. See all the flights for UA2121.
UAL2121 (SFO-PANC)
This United Airlines flight traveled from San Francisco International Airport to Ted Stevens Anchorage International Airport, on March 27, 2016. Passengers were flying aboard a Boeing 777-200. See all the flights for UA2121.
UAL2121 (SFO-XMN)
This United Airlines flight traveled from San Francisco International Airport to Xiamen Airport, on September 04, 2014. Passengers were flying aboard a Boeing 747-400. See all the flights for UA2121.
UAL2121 (SFO-ZSAM)
This United Airlines flight traveled from San Francisco International Airport to Xiamen Airport, on October 10, 2016. Passengers were flying aboard a Boeing 777-200. See all the flights for UA2121.
UAL2121 (SFO-ZSPD)
This United Airlines flight traveled from San Francisco International Airport to Pudong International Airport, on November 15, 2016. Passengers were flying aboard a Boeing 787 Dreamliner. See all the flights for UA2121.

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".