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

🇺🇸 N919NK - Airbus A320 271NSL - Spirit Airlines NKS1150/NK1150, Chicago O'Hare (ORD) to George Bush Intcntl/Houston (IAH) - 4.0 mi away @ 33300 ft, heading SSW at 517 mph. Spotted 5x before! [10:34:53 PM CST] #ACB950 #N919NK #A20N #SPIRIT_WINGS #NKS1150 #NK1150 #ADSB #ADSBbot