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 UAL1482/UA1482 (BOS-SFO-ORD) - 4.1 mi away @ 33725 ft, heading W at 516 mph. Spotted once before! [12:43:49 PM CDT] #A12F52 #N17589 #B39M #UNITED #UAL1482 #UA1482 #ADSB #ADSBbot