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

🇺🇸 N17589 - BOEING 737 MAX 9 - United Airlines UAL213/UA213 (TPA-ORD-IAD) - 4.5 mi away @ 35900 ft, heading NNE at 495 mph. Spotted 3x before! [07:27:26 PM CDT] #A12F52 #N17589 #B39M #UNITED #UAL213 #UA213 #ADSB #ADSBbot