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

🇺🇸 N858DZ - Boeing 737NG 932ER/W - Delta Air Lines DAL809/DL809 (ATL-SJC-ATL) - 4.5 mi away @ 35600 ft, heading SE at 639 mph. Spotted 27x before. [05:36:18 PM CST] #ABC573 #N858DZ #B739 #DELTA #DAL809 #DL809 #ADSB #ADSBbot