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

🇺🇸 N17564 - Boeing 737MAX 9 - United Airlines UAL1672/UA1672, Cancun (CUN) to Chicago O'Hare (ORD) - 4.1 mi away @ 33200 ft, heading NNE at 579 mph. Spotted 11x before. [10:07:57 AM CST] #A12F07 #N17564 #B39M #UNITED #UAL1672 #UA1672 #ADSB #ADSBbot

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

🇺🇸 N77581 - Boeing 737MAX 9 - United Airlines UAL1672/UA1672, Cancun (CUN) to Chicago O'Hare (ORD) - 4.1 mi away @ 34275 ft, heading N at 472 mph. Spotted 2x before. [09:57:27 AM CST] #AA7F24 #N77581 #B39M #UNITED #UAL1672 #UA1672 #ADSB #ADSBbot

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

🇺🇸 N37577 - Boeing 737MAX 9 - United Airlines UAL1672/UA1672, Cancun (CUN) to Chicago O'Hare (ORD) - 4.9 mi away @ 40225 ft, heading NNE at 497 mph. Spotted 6x before. [09:57:39 AM CST] #A449CB #N37577 #B39M #UNITED #UAL1672 #UA1672 #ADSB #ADSBbot

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

🇺🇸 N73445 - Boeing 737NG 924ER/W - United Airlines UAL1672/UA1672, Cancun (CUN) to Chicago O'Hare (ORD) - 4.4 mi away @ 35025 ft, heading N at 573 mph. Spotted 4x before! [09:49:20 AM CST] #A9DCE9 #N73445 #B739 #UNITED #UAL1672 #UA1672 #ADSB #ADSBbot

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

🇺🇸 N38458 - Boeing 737NG 924ER/W - United Airlines UAL1672/UA1672, Cancun (CUN) to Chicago O'Hare (ORD) - 3.9 mi away @ 31350 ft, heading NNE at 547 mph. Spotted 8x before! [10:00:41 AM CST] #A46D4E #N38458 #B739 #UNITED #UAL1672 #UA1672 #ADSB #ADSBbot