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

🇺🇸 N28457 - Boeing 737NG 924ER/W - United Airlines UAL1779/UA1779, Harry Reid (LAS) to Chicago O'Hare (ORD) - 3.8 mi away @ 32550 ft, heading ENE at 530 mph. Spotted 8x before! [07:31:24 PM CDT] #A2DFFE #N28457 #B739 #UNITED #UAL1779 #UA1779 #ADSB #ADSBbot