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

🇺🇸 N664DN - Boeing 757 232 - Delta Air Lines DAL8960/DL8960, Chicago Midway (MDW) to Dallas Love Field (DAL) - 4.6 mi away @ 40050 ft, heading SW at 519 mph. Spotted 3x before! [12:43:26 PM CDT] #A8C36D #N664DN #B752 #DELTA #DAL8960 #DL8960 #ADSB #ADSBbot