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

🇺🇸 N14534 - AIRBUS S A S A321-271NX - United Airlines UAL347/UA347 (SAN-DEN-IAD) - 3.9 mi away @ 34975 ft, heading E at 548 mph. Spotted once before! [04:26:15 PM CDT] #A0B821 #N14534 #A21N #UNITED #UAL347 #UA347 #ADSB #ADSBbot