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

🇺🇸 N942AK - Boeing 737MAX 9 - Alaska Airlines ASA670/AS670, Raleigh-Durham (RDU) to Seattle-Tacoma (SEA) - 4.1 mi away @ 34700 ft, heading WNW at 456 mph. Spotted 10x before. [08:19:10 AM CDT] #AD14A0 #N942AK #B39M #ALASKA #ASA670 #AS670 #ADSB #ADSBbot