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

🇺🇸 N14512 - Airbus A321 271NXSL - United Airlines UAL1823/UA1823 (ORD-IAH-RSW) - 4.6 mi away @ 35700 ft, heading SW at 500 mph. Spotted 3x before! [08:13:24 AM CDT] #A0B7D9 #N14512 #A21N #UNITED #UAL1823 #UA1823 #ADSB #ADSBbot

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

🇺🇸 N14529 - AIRBUS A321neo - UNITED AIRLINES INC UAL1823/UA1823, Chicago O'Hare (ORD) to George Bush Intcntl/Houston (IAH) - 4.4 mi away @ 35625 ft, heading SW at 526 mph. Spotted for first time! [08:09:25 AM CDT] #A0B803 #N14529 #A21N #UAL1823 #UA1823 #ADSB #ADSBbot

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

🇺🇸 N24526 - Airbus A321 271NXSL - United Airlines UAL1823/UA1823, Chicago O'Hare (ORD) to George Bush Intcntl/Houston (IAH) - 4.1 mi away @ 35025 ft, heading SW at 446 mph. Spotted once before! [08:11:35 AM CDT] #A2454F #N24526 #A21N #UNITED #UAL1823 #UA1823 #ADSB #ADSBbot