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

🇺🇸 N991NK - Airbus A320 271NSL - Spirit Airlines NKS2204/NK2204, Fort Lauderdale/Hollywood (FLL) to Chicago O'Hare (ORD) - 4.4 mi away @ 36425 ft, heading NNE at 590 mph. Spotted 4x before. [11:01:37 AM CDT] #ADD790 #N991NK #A20N #SPIRIT_WINGS #NKS2204 #NK2204 #ADSB #ADSBbot