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 SCX8850/SY8850, Billings Logan (BIL) to Nashville (BNA) - 4.4 mi away @ 37225 ft, heading SE at 558 mph. Spotted 4x before. [08:40:00 PM CST] #AB39F0 #N822SY #B738 #SUN_COUNTRY #SCX8850 #SY8850 #ADSB #ADSBbot