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

🇺🇸 N497UA - Airbus A320 232 - United Airlines UAL521/UA521, St Louis Lambert (STL) to George Bush Intcntl/Houston (IAH) - 3.2 mi away @ 9050 ft, heading SSW at 315 mph. Spotted 37x before. [06:09:10 PM CST] #A62BDC #N497UA #A320 #UNITED #UAL521 #UA521 #TakingOff #Departure #ADSB #ADSBbot

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

🇺🇸 N458UA - Airbus A320 232 - United Airlines UAL521/UA521, St Louis Lambert (STL) to George Bush Intcntl/Houston (IAH) - 3.7 mi away @ 10050 ft, heading SSW at 319 mph. Spotted 25x before. [04:54:24 PM CST] #A59197 #N458UA #A320 #UNITED #UAL521 #UA521 #TakingOff #Departure #ADSB #ADSBbot