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

🇺🇸 N77584 - Boeing 737MAX 9 - United Airlines UAL2039/UA2039 (LAS-LAX-BWI) - 4.2 mi away @ 36725 ft, heading E at 540 mph. Spotted once before! [03:26:37 PM CDT] #AA7F27 #N77584 #B39M #UNITED #UAL2039 #UA2039 #ADSB #ADSBbot

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

🇺🇸 N77542 - Boeing 737NG 800/W - United Airlines UAL2039/UA2039 (LAS-LAX-BWI) - 10.5 mi away @ 38575 ft, heading E at 601 mph. Spotted 16x before! [02:01:28 PM CDT] #AA7E99 #N77542 #B738 #UNITED #UAL2039 #UA2039 #ADSB #ADSBbot