Flights for the airplane with tail number N37521 These are not all the flights for this airplane, just the ones that have flown in and out of SFO since we've been counting. See all the airports this plane has visited for those flights or all the airplanes we've logged so far.

UA1639 (OGG-SFO)
This United Airlines flight between Kahului Airport and San Francisco International Airport, on September 25, 2023, was operated by another airline. It arrived at gate F12. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA1639.
UA1826 (SFO-DEN)
This United Airlines flight between San Francisco International Airport and Denver International Airport, on August 28, 2023, was operated by another airline. It departed from gate E8. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA1826.
UA573 (DEN-SFO)
This United Airlines flight between Denver International Airport and San Francisco International Airport, on August 28, 2023, was operated by another airline. It arrived at gate E8. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA573.
UA733 (SFO-DEN)
This United Airlines flight between San Francisco International Airport and Denver International Airport, on August 27, 2023, was operated by another airline. It departed from gate E13. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA733.
UA729 (PDX-SFO)
This United Airlines flight between Portland International Airport and San Francisco International Airport, on August 27, 2023, was operated by another airline. It arrived at gate E13. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA729.
UA1942 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on August 27, 2023, was operated by another airline. It departed from gate D10. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA1942.
UA2114 (FLL-SFO)
This United Airlines flight between Fort Lauderdale Hollywood International Airport and San Francisco International Airport, on August 27, 2023, was operated by another airline. It arrived at gate D11. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA2114.
UA1802 (DEN-SFO)
This United Airlines flight between Denver International Airport and San Francisco International Airport, on August 21, 2023, was operated by another airline. It arrived at gate F2. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA1802.
UA1403 (CLE-SFO)
This United Airlines flight between Hopkins International Airport and San Francisco International Airport, on August 19, 2023, was operated by another airline. It arrived at gate F14. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA1403.
UA470 (MCO-SFO)
This United Airlines flight between Orlando International Airport and San Francisco International Airport, on August 17, 2023, was operated by another airline. It arrived at gate E4. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA470.
UA1066 (YYC-SFO)
This United Airlines flight between Calgary International Airport and San Francisco International Airport, on August 16, 2023, was operated by another airline. It arrived at gate E13. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA1066.
UA1615 (CLE-SFO)
This United Airlines flight between Hopkins International Airport and San Francisco International Airport, on August 16, 2023, was operated by another airline. It arrived at gate E13. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA1615.