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

🇺🇸 N27251 - Boeing 737MAX 8 - United Airlines UAL406/UA406 (SFO-LAS-EWR) - 4.1 mi away @ 32975 ft, heading ENE at 594 mph. Spotted 7x before! [03:51:16 AM CDT] #A2B10B #N27251 #B38M #UNITED #UAL406 #UA406 #ADSB #ADSBbot

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

🇺🇸 N24224 - Boeing 737NG 824/W - United Airlines UAL406/UA406, Chicago O'Hare (ORD) to San Antonio (SAT) - 4.9 mi away @ 40250 ft, heading SW at 535 mph. Spotted 15x before! [04:45:46 PM CDT] #A23A28 #N24224 #B738 #UNITED #UAL406 #UA406 #ADSB #ADSBbot

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

🇺🇸 N34131 - Boeing 757 224/W - United Airlines UAL406/UA406, Harry Reid (LAS) to Newark Liberty (EWR) - 4.7 mi away @ 38625 ft, heading ENE at 615 mph. Spotted 2x before! [04:01:48 AM CST] #A3C3E0 #N34131 #B752 #UNITED #UAL406 #UA406 #ADSB #ADSBbot