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

🇺🇸 N918DU - Boeing 737NG 900ER/W - Delta Air Lines DAL864/DL864, Harry Reid (LAS) to Detroit Metro Wayne County (DTW) - 3.6 mi away @ 31650 ft, heading ENE at 642 mph. Spotted 20x before. [10:40:33 AM CST] #ACB4C1 #N918DU #B739 #DELTA #DAL864 #DL864 #ADSB #ADSBbot