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

🇺🇸 N76529 - Boeing 737NG 824/W - United Airlines UAL551/UA551, St Louis Lambert (STL) to Denver (DEN) - 3.7 mi away @ 9425 ft, heading SSW at 330 mph. Spotted 16x before. [06:13:33 PM CST] #AA56DB #N76529 #B738 #UNITED #UAL551 #UA551 #TakingOff #Departure #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 UAL551/UA551, St Louis Lambert (STL) to Denver (DEN) - 3.4 mi away @ 19300 ft, heading WNW at 387 mph. Spotted 20x before. [07:47:45 PM CST] #AA7E99 #N77542 #B738 #UNITED #UAL551 #UA551 #Departure #ADSB #ADSBbot

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

🇺🇸 N37274 - BOEING 737-824 - United Airlines UAL551/UA551, St Louis Lambert (STL) to Denver (DEN) - 3.4 mi away @ 15300 ft, heading NW at 429 mph. Spotted 19x before. [06:35:06 PM CST] #A43EA3 #N37274 #B738 #UNITED #UAL551 #UA551 #Departure #ADSB #ADSBbot