Map of the St. Louis area showing the position and track of the aircraft described in the post.
🇺🇸 N795UA - Boeing 777 222ER - United Airlines UAL879/UA879, London Heathrow (LHR) to George Bush Intcntl/Houston (IAH) - 4.2 mi away @ 36175 ft, heading SSW at 523 mph. Spotted 3x before. [12:30:27 PM CDT] #AACC5B #N795UA #B772 #UNITED #UAL879 #UA879 #ADSB #ADSBbot