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

🇺🇸 N18223 - Boeing 737NG 824/W - United Airlines UAL1878/UA1878, Austin-Bergstrom (AUS) to Chicago O'Hare (ORD) - 4.3 mi away @ 33800 ft, heading N at 576 mph. Spotted 16x before! [08:50:04 AM CST] #A14AD4 #N18223 #B738 #UNITED #UAL1878 #UA1878 #ADSB #ADSBbot

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

🇺🇸 N75432 - Boeing 737NG 924ER/W - United Airlines UAL1878/UA1878, Austin-Bergstrom (AUS) to Chicago O'Hare (ORD) - 4.4 mi away @ 34325 ft, heading NNE at 506 mph. Spotted 5x before! [08:47:22 AM CDT] #AA2BC1 #N75432 #B739 #UNITED #UAL1878 #UA1878 #ADSB #ADSBbot

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

🇺🇸 N17358 - Boeing 737MAX 8 - United Airlines UAL1878/UA1878 (AUS-ORD-SFO) - 5.8 mi away @ 38900 ft, heading NNE at 485 mph. Spotted once before! [08:54:51 AM CDT] #A1277A #N17358 #B38M #UNITED #UAL1878 #UA1878 #ADSB #ADSBbot