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

🇺🇸 N212UA - Boeing 777 222 - United Airlines UAL1423/UA1423, Cancun (CUN) to Chicago O'Hare (ORD) - 4.6 mi away @ 36650 ft, heading N at 507 mph. Spotted 4x before! [05:14:53 PM CST] #A1C2B3 #N212UA #B772 #UNITED #UAL1423 #UA1423 #ADSB #ADSBbot

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

🇺🇸 N212UA - Boeing 777 222 - United Airlines UAL1423/UA1423, Cancun (CUN) to Chicago O'Hare (ORD) - 4.0 mi away @ 35075 ft, heading NNE at 627 mph. Spotted 3x before! [08:07:36 PM CST] #A1C2B3 #N212UA #B772 #UNITED #UAL1423 #UA1423 #ADSB #ADSBbot

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

🇺🇸 N212UA - Boeing 777 222 - United Airlines UAL1728/UA1728 (RSW-IAD-DEN) - 4.5 mi away @ 37875 ft, heading W at 484 mph. Spotted 2x before! [06:41:37 PM CDT] #A1C2B3 #N212UA #B772 #UNITED #UAL1728 #UA1728 #ADSB #ADSBbot