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

🇺🇸 N63890 - Boeing 737NG 924ER/W - United Airlines UAL511/UA511, Chicago O'Hare (ORD) to Phoenix Sky Harbor (PHX) - 4.3 mi away @ 31475 ft, heading SW at 508 mph. Spotted 13x before! [05:30:12 PM CDT] #A85F20 #N63890 #B739 #UNITED #UAL511 #UA511 #ADSB #ADSBbot