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

🇺🇸 N87531 - Boeing 737NG 824/W - United Airlines UAL1666/UA1666, Cincinnati/Northern Kentucky (CVG) to Denver (DEN) - 4.8 mi away @ 37875 ft, heading W at 524 mph. Spotted 10x before! [07:48:09 AM CDT] #AC0BC4 #N87531 #B738 #UNITED #UAL1666 #UA1666 #ADSB #ADSBbot

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

🇺🇸 N14231 - Boeing 737NG 824/W - United Airlines UAL1666/UA1666, Cincinnati/Northern Kentucky (CVG) to Denver (DEN) - 4.5 mi away @ 38125 ft, heading W at 474 mph. Spotted 15x before! [08:11:30 AM CDT] #A0ACF9 #N14231 #B738 #UNITED #UAL1666 #UA1666 #ADSB #ADSBbot

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

🇺🇸 N12218 - Boeing 737NG 824/W - United Airlines UAL1666/UA1666, Cincinnati/Northern Kentucky (CVG) to Denver (DEN) - 4.7 mi away @ 38400 ft, heading W at 535 mph. Spotted 17x before! [07:51:24 AM CDT] #A05DBC #N12218 #B738 #UNITED #UAL1666 #UA1666 #ADSB #ADSBbot