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

🇺🇸 N37427 - Boeing 737NG 924ER/W - United Airlines UAL1863/UA1863 (RSW-ORD-SFO) - 4.0 mi away @ 34075 ft, heading N at 527 mph. Spotted 10x before! [01:31:27 PM CDT] #A44565 #N37427 #B739 #UNITED #UAL1863 #UA1863 #ADSB #ADSBbot