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

🇺🇸 N57863 - Boeing 757 33N/W - United Airlines UAL2276/UA2276 (MSY-IAD-LAX) - 4.2 mi away @ 35550 ft, heading W at 506 mph. Spotted 2x before! [06:29:57 PM CDT] #A76F67 #N57863 #B753 #UNITED #UAL2276 #UA2276 #ADSB #ADSBbot