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

🇺🇸 N77538 - Boeing 737NG 800/W - United Airlines UAL1788/UA1788 (SFO-IAH-IAD) - 4.5 mi away @ 36675 ft, heading NE at 602 mph. Spotted 8x before! [07:34:51 PM CDT] #AA7E7C #N77538 #B738 #UNITED #UAL1788 #UA1788 #ADSB #ADSBbot