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

🇺🇸 N428AS - Boeing 737NG 990ER/W - Alaska Airlines ASA291/AS291 (SEA-STL-SEA) - 4.5 mi away @ 8800 ft, heading ESE at 316 mph. Spotted 5x before! [06:40:54 PM CDT] #A51968 #N428AS #B739 #ALASKA #ASA291 #AS291 #Landing #ADSB #ADSBbot

Planefence ICAO: A51968
Flt: ASA537 ALASKAAIRLINES BOS - SEA
First seen: 2025-04-30 10:15:01 EDT
Min Alt: 2200 ft MSL
Min Dist: 0.29 mi
adsb planefence by kx1t - adsbexchange - planefence

Planefence ICAO: A51968
Flt: ASA364 ALASKAAIRLINES BOS - SEA
First seen: 2025-03-06 18:42:04 EST
Min Alt: 2975 ft MSL
Min Dist: 0.86 mi
adsb planefence by kx1t - adsbexchange - planefence

Planefence ICAO: A51968
Flt: ASA364 ALASKAAIRLINES BOS - SEA
First seen: 2025-02-23 18:58:02 EST
Min Alt: 2375 ft MSL
Min Dist: 0.52 mi
adsb planefence by kx1t - adsbexchange - planefence