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.

UA2158 (SFO-LAS)
This United Airlines flight between San Francisco International Airport and McCarran International Airport, on October 25, 2023, was operated by another airline. It departed from gate E5. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA2158.
UA646 (RNO-SFO)
This United Airlines flight between Reno-Tahoe International Airport and San Francisco International Airport, on October 25, 2023, was operated by another airline. It arrived at gate E5. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA646.
UA2176 (SFO-RNO)
This United Airlines flight between San Francisco International Airport and Reno-Tahoe International Airport, on October 24, 2023, was operated by another airline. It departed from gate F20. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA2176.
UA2496 (LAX-SFO)
This United Airlines flight between Los Angeles International Airport and San Francisco International Airport, on October 24, 2023, was operated by another airline. It arrived at gate F20. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA2496.
UA1413 (SFO-LAX)
This United Airlines flight between San Francisco International Airport and Los Angeles International Airport, on October 24, 2023, was operated by another airline. It departed from gate F15. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA1413.
UA2318 (LAX-SFO)
This United Airlines flight between Los Angeles International Airport and San Francisco International Airport, on October 24, 2023, was operated by another airline. It arrived at gate F15. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA2318.
UA2414 (IAH-SFO)
This United Airlines flight between George Bush Intercontinental Airport and San Francisco International Airport, on October 09, 2023, was operated by another airline. It arrived at gate F16. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA2414.
UA2024 (SFO-IAH)
This United Airlines flight between San Francisco International Airport and George Bush Intercontinental Airport, on October 09, 2023, was operated by another airline. It departed from gate F21. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA2024.
UA733 (YVR-SFO)
This United Airlines flight between Vancouver International Airport and San Francisco International Airport, on September 26, 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 UA733.
UA784 (SFO-YVR)
This United Airlines flight between San Francisco International Airport and Vancouver International Airport, on September 26, 2023, was operated by another airline. It departed from gate F17. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA784.
UA539 (SFO-OGG)
This United Airlines flight between San Francisco International Airport and Kahului Airport, on September 25, 2023, was operated by another airline. It departed from gate E12. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA539.
UA1878 (ORD-SFO)
This United Airlines flight between Chicago O'Hare International Airport and San Francisco International Airport, on September 25, 2023, was operated by another airline. It arrived at gate E12. Passengers were flying aboard a Boeing 737-MAX 9 with tail number N37521. See all the flights for UA1878.