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

🇺🇸 N17963 - Boeing 787 9 - United Airlines UAL1475/UA1475, Newark Liberty (EWR) to San Francisco (SFO) - 5.0 mi away @ 42300 ft, heading W at 549 mph. Spotted 3x before! [02:47:22 PM CDT] #A13DE2 #N17963 #B789 #UNITED #UAL1475 #UA1475 #autopilot #ADSB #ADSBbot