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

🇺🇸 N814NV - Boeing 737MAX 8 200 - Allegiant Air AAY2904/G42904, Orlando Sanford (SFB) to Quad Cities (MLI) - 4.3 mi away @ 35850 ft, heading NNW at 577 mph. Spotted for first time! [07:22:48 AM CDT] #AB1978 #N814NV #B38M #ALLEGIANT #AAY2904 #G42904 #ADSB #ADSBbot