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

🇺🇸 N37535 - Boeing 737MAX 9 - United Airlines UAL1573/UA1573, Los Angeles (LAX) to Washington Dulles (IAD) - 4.5 mi away @ 35900 ft, heading E at 603 mph. Spotted 3x before. [09:45:31 PM CST] #A4493D #N37535 #B39M #UNITED #UAL1573 #UA1573 #ADSB #ADSBbot

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

🇺🇸 N37456 - Boeing 737NG 924ER/W - United Airlines UAL1573/UA1573 (SFO-LAX-IAD) - 4.6 mi away @ 37200 ft, heading ENE at 539 mph. Spotted 11x before! [09:56:13 PM CDT] #A445CD #N37456 #B739 #UNITED #UAL1573 #UA1573 #ADSB #ADSBbot