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

🇺🇸 N74856 - Boeing 757 324/W - United Airlines UAL501/UA501 (SFO-DEN-MCO) - 4.8 mi away @ 35950 ft, heading SE at 550 mph. Spotted 4x before! [04:53:42 PM CDT] #AA1368 #N74856 #B753 #UNITED #UAL501 #UA501 #ADSB #ADSBbot