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

🇺🇸 N491UA - Airbus A320 232 - United Airlines UAL600/UA600, Baltimore/Washington Thurgood Marshall (BWI) to George Bush Intcntl/Houston (IAH) - 4.4 mi away @ 35725 ft, heading SW at 485 mph. Spotted 18x before! [04:10:54 PM CDT] #A61592 #N491UA #A320 #UNITED #UAL600 #UA600 #ADSB #ADSBbot