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

🇺🇸 N722AL - Boeing 737MAX 9 - Alaska Airlines ASA521/AS521, Nashville (BNA) to Seattle-Tacoma (SEA) - 4.3 mi away @ 33175 ft, heading NW at 486 mph. Spotted 2x before! [08:17:13 PM CDT] #A9AB05 #N722AL #B39M #ALASKA #ASA521 #AS521 #ADSB #ADSBbot