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

🇺🇸 N913AK - Boeing 737MAX 9 - Alaska Airlines ASA305/AS305 (SEA-MIA-SEA) - 3.9 mi away @ 33500 ft, heading NW at 481 mph. Spotted 6x before! [07:58:26 PM CDT] #ACA1DA #N913AK #B39M #ALASKA #ASA305 #AS305 #ADSB #ADSBbot