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

🇺🇸 N76515 - Boeing 737NG 824/W - United Airlines UAL349/UA349, Cozumel (CZM) to Chicago O'Hare (ORD) - 3.5 mi away @ 29100 ft, heading NNE at 475 mph. Spotted 12x before. [03:52:18 PM CST] #AA56B4 #N76515 #B738 #UNITED #UAL349 #UA349 #ADSB #ADSBbot

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

🇺🇸 N87507 - Boeing 737NG 824/W - United Airlines UAL349/UA349, Cozumel (CZM) to Chicago O'Hare (ORD) - 4.3 mi away @ 36925 ft, heading NNE at 532 mph. Spotted 18x before. [04:29:51 PM CST] #AC0B61 #N87507 #B738 #UNITED #UAL349 #UA349 #ADSB #ADSBbot

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

🇺🇸 N77539 - Boeing 737NG 800/W - United Airlines UAL349/UA349, Cozumel (CZM) to Chicago O'Hare (ORD) - 4.6 mi away @ 38050 ft, heading NNW at 455 mph. Spotted 8x before! [03:53:02 PM CST] #AA7E7D #N77539 #B738 #UNITED #UAL349 #UA349 #ADSB #ADSBbot

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

🇺🇸 N36280 - Boeing 737NG 824/W - United Airlines UAL349/UA349, Cozumel (CZM) to Chicago O'Hare (ORD) - 4.0 mi away @ 34650 ft, heading NNE at 455 mph. Spotted 4x before! [04:07:10 PM CST] #A41743 #N36280 #B738 #UNITED #UAL349 #UA349 #ADSB #ADSBbot