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

🇺🇸 N215UA - Boeing 777 222 - United Airlines UAL1423/UA1423, Cancun (CUN) to Chicago O'Hare (ORD) - 5.0 mi away @ 37500 ft, heading NNE at 523 mph. Spotted 2x before. [06:40:52 PM CST] #A1CDD8 #N215UA #B772 #UNITED #UAL1423 #UA1423 #ADSB #ADSBbot

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