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

🇺🇸 N77542 - Boeing 737NG 800/W - United Airlines UAL1683/UA1683, Chicago O'Hare (ORD) to San Antonio (SAT) - 3.5 mi away @ 28950 ft, heading SW at 447 mph. Spotted 22x before. [05:16:30 PM CST] #AA7E99 #N77542 #B738 #UNITED #UAL1683 #UA1683 #ADSB #ADSBbot