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

🇺🇸 N37508 - Boeing 737MAX 9 - United Airlines UAL1470/UA1470, Washington Dulles (IAD) to Los Angeles (LAX) - 4.1 mi away @ 33750 ft, heading W at 415 mph. Spotted 9x before! [08:40:41 PM CST] #A448D7 #N37508 #B39M #UNITED #UAL1470 #UA1470 #ADSB #ADSBbot