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

🇺🇸 N822SY - Boeing 737NG 8BK/W - Sun Country Airlines SCX8876/SY8876, Bozeman Yellowstone (BZN) to Nashville (BNA) - 4.1 mi away @ 35375 ft, heading SE at 570 mph. Spotted 3x before. [12:22:22 PM CST] #AB39F0 #N822SY #B738 #SUN_COUNTRY #SCX8876 #SY8876 #ADSB #ADSBbot