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

🇺🇸 N78524 - Boeing 737NG 824/W - United Airlines UAL557/UA557, Charleston Afb/International (CHS) to Denver (DEN) - 20.4 mi away @ 37325 ft, heading WNW at 427 mph. Spotted 15x before! [05:10:05 PM CDT] #AAA5D4 #N78524 #B738 #UNITED #UAL557 #UA557 #ADSB #ADSBbot