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

🇺🇸 N737NK - AIRBUS A321neo - ALC A321 72024 LLC NKS2151/NK2151, Dallas-Fort Worth (DFW) to General Edward Lawrence Logan (BOS) - 4.2 mi away @ 36750 ft, heading NE at 572 mph. Spotted once before! [03:48:14 PM CDT] #A9E642 #N737NK #A21N #NKS2151 #NK2151 #ADSB #ADSBbot