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

🇺🇸 N13954 - Boeing 787 9 - United Airlines UAL1578/UA1578, Newark Liberty (EWR) to Los Angeles (LAX) - 5.4 mi away @ 42350 ft, heading WSW at 570 mph. Spotted once before! [04:59:25 PM CDT] #A09FC4 #N13954 #B789 #UNITED #UAL1578 #UA1578 #autopilot #ADSB #ADSBbot