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

🇺🇸 N952AK - Boeing 737MAX 9 - Alaska Airlines ASA291/AS291 (SEA-STL-SEA) - 3.4 mi away @ 13575 ft, heading NW at 392 mph. Spotted 3x before! [06:37:26 PM CDT] #AD3C1F #N952AK #B39M #ALASKA #ASA291 #AS291 #TakingOff #ADSB #ADSBbot