ICAO: AAA593
Owner: UNITEDAIRLINES
Flt: UAL521 N78509 B738 ATL-IAH-BOS
Time: 2026-03-21 23:11:49 EDT
Min Alt: 8675 ft
Min Dist: 0.8 nm (49deg NE)
Squawk: 7474
dev adsb planefence by kx1t - sdr-e airplanes flightaware faa

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

🇺🇸 N78509 - Boeing 737NG 824/W - United Airlines UAL1422/UA1422, Denver (DEN) to St Louis Lambert (STL) - 5.4 mi away @ 7350 ft, heading ESE at 335 mph. Spotted 14x before. [08:31:25 PM CST] #AAA593 #N78509 #B738 #UNITED #UAL1422 #UA1422 #Landing #Arrival #ADSB #ADSBbot

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

🇺🇸 N78509 - Boeing 737NG 824/W - United Airlines UAL457/UA457 (JAX-ORD-AUS) - 4.7 mi away @ 37675 ft, heading SW at 517 mph. Spotted 13x before! [09:19:52 PM CDT] #AAA593 #N78509 #B738 #UNITED #UAL457 #UA457 #ADSB #ADSBbot

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

🇺🇸 N78509 - Boeing 737NG 824/W - United Airlines UAL1729/UA1729 (LGA-DEN-SEA) - 4.6 mi away @ 37250 ft, heading W at 540 mph. Spotted 12x before! [06:10:37 PM CDT] #AAA593 #N78509 #B738 #UNITED #UAL1729 #UA1729 #ADSB #ADSBbot

Planefence ICAO: AAA593
Flt: UAL2040 UNITEDAIRLINES PHL - IAH
First seen: 2025-03-25 16:37:49 EDT
Min Alt: 2950 ft MSL
Min Dist: 0.3 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.

🇺🇸 N78509 - Boeing 737NG 824/W - United Airlines UAL729/UA729, Chicago O'Hare (ORD) to Dallas-Fort Worth (DFW) - 4.6 mi away @ 36300 ft, heading SW at 391 mph. Spotted 11x before! [08:00:42 AM CDT] #AAA593 #N78509 #B738 #UNITED #UAL729 #UA729 #ADSB #ADSBbot