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

🇺🇸 N720NK - Airbus A321 271NXSL - Spirit Airlines NKS1379/NK1379, Fort Lauderdale/Hollywood (FLL) to Chicago O'Hare (ORD) - 4.5 mi away @ 36875 ft, heading NNE at 506 mph. Spotted 3x before! [10:26:35 AM CDT] #A9A4C2 #N720NK #A21N #SPIRIT_WINGS #NKS1379 #NK1379 #ADSB #ADSBbot