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

🇺🇸 N499AZ - Boeing 767 323ERBDSF/W - Prime Air ATN3342/8C3342, George Bush Intcntl/Houston (IAH) to Chicago/Rockford (RFD) - 4.3 mi away @ 36000 ft, heading NNE at 570 mph. Spotted 23x before. [05:19:08 PM CDT] #A6319F #N499AZ #B763 #AIR_TRANSPORT #ATN3342 #8C3342 #ADSB #ADSBbot