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

🇺🇸 N77573 - Boeing 737MAX 9 - United Airlines UAL1851/UA1851 (ORD-IAH-LAX) - 4.3 mi away @ 35750 ft, heading SW at 440 mph. Spotted 3x before! [08:11:59 PM CST] #AA7F03 #N77573 #B39M #UNITED #UAL1851 #UA1851 #ADSB #ADSBbot

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

🇺🇸 N447UA - Airbus A320 232 - United Airlines UAL1851/UA1851 (BTV-ORD-SAT) - 3.8 mi away @ 32375 ft, heading SW at 457 mph. Spotted 29x before! [10:30:02 AM CDT] #A56661 #N447UA #A320 #UNITED #UAL1851 #UA1851 #ADSB #ADSBbot

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

🇺🇸 N74532 - AIRBUS S A S A321-271NX - UNITED AIRLINES INC UAL1851/UA1851, Chicago O'Hare (ORD) to George Bush Intcntl/Houston (IAH) - 4.6 mi away @ 34200 ft, heading SW at 497 mph. Spotted for first time! [10:10:35 AM CST] #AA07F9 #N74532 #A21N #UAL1851 #UA1851 #ADSB #ADSBbot