Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N27253 - Boeing 737MAX 8 - United Airlines UAL359/UA359, Chicago O'Hare (ORD) to Licenciado Benito Juarez (MEX) - 3.8 mi away @ 31650 ft, heading SW at 399 mph. Spotted 5x before. [11:14:49 AM CST] #A2B10D #N27253 #B38M #UNITED #UAL359 #UA359 #ADSB #ADSBbot

ICAO: A2B10D
Owner: UNITED AIRLINES
Flt: UAL521 N27253 B38M BOS-EWR
Time: 2025-12-01 18:39:33 EST
Min Alt: 8025 ft
Min Dist: 7.8 nm (146° SE)
dev adsb planefence by kx1t -•sdr-e•airplanes•flightaware•faa

Planefence ICAO: A2B10D
Flt: UAL521 UNITEDAIRLINES JFK - SFO
First seen: 2025-12-01 18:37:54 EST
Min Alt: 2975 ft MSL
Min Dist: 0.34 mi
adsb planefence by kx1t - adsbexchange - planefence

Planefence ICAO: A2B10D
Flt: UAL521 UNITEDAIRLINES JFK - SFO
First seen: 2025-12-01 18:38:29 EST
Min Alt: 4075 ft MSL
Min Dist: 1.37 nm
adsb planefence by kx1t - airplanes.live - planefence

Planefence ICAO: A2B10D
Flt: UAL521 UNITEDAIRLINES JFK - SFO
First seen: 2025-11-16 18:36:03 EST
Min Alt: 4350 ft MSL
Min Dist: 0.38 mi
adsb planefence by kx1t - adsbexchange - planefence

Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N27253 - Boeing 737MAX 8 - United Airlines UAL2660/UA2660 (STL-DEN-SBA) - 3.3 mi away @ 14375 ft, heading WNW at 423 mph. Spotted 4x before! [05:26:40 PM CDT] #A2B10D #N27253 #B38M #UNITED #UAL2660 #UA2660 #Landing #ADSB #ADSBbot

Planefence ICAO: A2B10D
Flt: UAL353 UNITEDAIRLINES SAN - EWR
First seen: 2025-05-17 18:52:49 EDT
Min Alt: 475 ft MSL
Min Dist: 1.81 nm
adsb planefence by kx1t - airplanes.live - planefence

Planefence ICAO: A2B10D
Flt: UAL2136 UNITEDAIRLINES LAX - BOS
First seen: 2025-03-28 19:51:34 EDT
Min Alt: 4125 ft MSL
Min Dist: 1.06 nm
adsb planefence by kx1t - airplanes.live - planefence

Planefence ICAO: A2B10D
Flt: UAL2136 UNITEDAIRLINES LAX - BOS
First seen: 2025-03-28 19:50:59 EDT
Min Alt: 2350 ft MSL
Min Dist: 0.11 mi
adsb planefence by kx1t - adsbexchange - planefence

Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N27253 - Boeing 737MAX 8 - United Airlines UAL350/UA350, Denver (DEN) to Tampa (TPA) - 4.5 mi away @ 34825 ft, heading ESE at 549 mph. Spotted 3x before! [04:14:28 PM CST] #A2B10D #N27253 #B38M #UNITED #UAL350 #UA350 #ADSB #ADSBbot