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

🇺🇸 N993NK - Airbus A320 271NSL - Spirit Airlines NKS2456/NK2456, Harry Reid (LAS) to Baltimore/Washington Thurgood Marshall (BWI) - 4.4 mi away @ 37650 ft, heading E at 601 mph. Spotted 3x before! [02:36:24 AM CST] #ADDEFE #N993NK #A20N #SPIRIT_WINGS #NKS2456 #NK2456 #ADSB #ADSBbot