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

🇺🇸 N14504 - Airbus A321 271NXSL - United Airlines UAL8188/UA8188 (LAX-IAD-BOS) - 5.9 mi away @ 37150 ft, heading E at 534 mph. Spotted 3x before! [09:23:53 PM CDT] #A0B7B8 #N14504 #A21N #UNITED #UAL8188 #UA8188 #ADSB #ADSBbot

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

🇺🇸 N17337 - Boeing 737MAX 8 - United Airlines UAL8188/UA8188 (LAX-IAD-BOS-EWR) - 5.1 mi away @ 41475 ft, heading E at 553 mph. Spotted 3x before! [02:46:05 AM CDT] #A12733 #N17337 #B38M #UNITED #UAL8188 #UA8188 #ADSB #ADSBbot