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

🇺🇸 N75854 - Boeing 757 324/W - United Airlines UAL1987/UA1987, Los Angeles (LAX) to Washington Dulles (IAD) - 4.3 mi away @ 36725 ft, heading E at 542 mph. Spotted 5x before! [01:20:41 PM CDT] #AA3AE5 #N75854 #B753 #UNITED #UAL1987 #UA1987 #ADSB #ADSBbot