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

🇺🇸 N816NV - BOEING 737 MAX 8 - ALLEGIANT AIR LLC AAY494/G4494, Joe Foss Field (FSD) to Fort Lauderdale/Hollywood (FLL) - 4.7 mi away @ 37450 ft, heading SE at 533 mph. Spotted once before. [08:03:19 PM CST] #AB20E6 #N816NV #B38M #AAY494 #G4494 #ADSB #ADSBbot