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

🇺🇸 N881UA - Airbus A319 132 - United Airlines UAL1897/UA1897, Vancouver (YVR) to San Francisco (SFO) - 4.5 mi away @ 37875 ft, heading SW at 484 mph. Spotted 28x before! [06:53:51 AM CDT] #AC234F #N881UA #A319 #UNITED #UAL1897 #UA1897 #ADSB #ADSBbot