Map of the St. Louis area showing the position and track of the aircraft described in the post.
🇺🇸 N17356 - Boeing 737MAX 8 - United Airlines UAL1673/UA1673 (CLE-ORD-DFW) - 4.5 mi away @ 37600 ft, heading SW at 453 mph. Spotted 5x before. [09:46:56 PM CST] #A12778 #N17356 #B38M #UNITED #UAL1673 #UA1673 #ADSB #ADSBbot