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

🇺🇸 N37514 - Boeing 737MAX 9 - United Airlines UAL797/UA797, Washington Dulles (IAD) to Los Angeles (LAX) - 4.1 mi away @ 34350 ft, heading W at 491 mph. Spotted 6x before. [08:04:28 PM CDT] #A448F6 #N37514 #B39M #UNITED #UAL797 #UA797 #ADSB #ADSBbot