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

🇺🇸 N37523 - Boeing 737MAX 9 - United Airlines UAL8255/UA8255 (FLL-ORD-SEA) - 4.5 mi away @ 36975 ft, heading SW at 447 mph. Spotted 4x before. [09:03:00 PM CST] #A44918 #N37523 #B39M #UNITED #UAL8255 #UA8255 #ADSB #ADSBbot

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

🇺🇸 N14523 - Airbus A321 271NXSL - United Airlines UAL8255/UA8255 (LAS-LAX-IAD-PIT) - 4.0 mi away @ 34875 ft, heading SW at 528 mph. Spotted for first time! [08:53:22 PM CDT] #A0B7FD #N14523 #A21N #UNITED #UAL8255 #UA8255 #ADSB #ADSBbot

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

🇺🇸 N14533 - AIRBUS S A S A321-271NX - UNITED AIRLINES INC UAL8255/UA8255 (LAS-LAX-IAD-PIT) - 4.4 mi away @ 34575 ft, heading SW at 546 mph. Spotted once before! [09:07:39 PM CDT] #A0B820 #N14533 #A21N #UAL8255 #UA8255 #ADSB #ADSBbot