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

🇺🇸 N746NK - AIRBUS A321neo - Spirit Airlines NKS1834/NK1834, Baltimore/Washington Thurgood Marshall (BWI) to Los Angeles (LAX) - 4.4 mi away @ 35750 ft, heading W at 507 mph. Spotted for first time! [08:48:20 PM CDT] #AA0A0A #N746NK #A21N #SPIRIT_WINGS #NKS1834 #NK1834 #ADSB #ADSBbot