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

🇺🇸 N8840Q - Boeing 737MAX 8 - Southwest Airlines SWA2423/WN2423, St Louis Lambert (STL) to Denver (DEN) - 3.6 mi away @ 15850 ft, heading WNW at 367 mph. Spotted 90x before. [10:38:28 PM CDT] #AC2F18 #N8840Q #B38M #SOUTHWEST #SWA2423 #WN2423 #Departure #ADSB #ADSBbot

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

🇺🇸 N8502Z - Boeing 737NG 800/W - Southwest Airlines SWA2423/WN2423, St Louis Lambert (STL) to Denver (DEN) - 3.5 mi away @ 16475 ft, heading WNW at 398 mph. Spotted 89x before. [10:25:26 PM CDT] #ABAA0E #N8502Z #B738 #SOUTHWEST #SWA2423 #WN2423 #Departure #ADSB #ADSBbot