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

🇺🇸 N214UA - Boeing 777 222 - United Airlines UAL2720/UA2720, Washington Dulles (IAD) to Los Angeles (LAX) - 4.6 mi away @ 38050 ft, heading WSW at 535 mph. Spotted 4x before! [09:14:38 AM CDT] #A1CA21 #N214UA #B772 #UNITED #UAL2720 #UA2720 #ADSB #ADSBbot