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

🇺🇸 N215UA - Boeing 777 222 - United Airlines UAL737/UA737, San Francisco (SFO) to Newark Liberty (EWR) - 4.4 mi away @ 37025 ft, heading ENE at 586 mph. Spotted once before! [04:50:12 AM CDT] #A1CDD8 #N215UA #B772 #UNITED #UAL737 #UA737 #ADSB #ADSBbot