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

🇺🇸 N421UP - Boeing 757 24APF - United Parcel Service UPS2066/5X2066, Ontario (ONT) to Bradley (BDL) - 4.7 mi away @ 39875 ft, heading ENE at 525 mph. Spotted 7x before! [04:17:16 PM CDT] #A50126 #N421UP #B752 #UPS #UPS2066 #5X2066 #ADSB #ADSBbot