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

🇺🇸 N947AK - Boeing 737MAX 9 - Alaska Airlines ASA485/AS485, Charleston Afb/International (CHS) to Seattle-Tacoma (SEA) - 4.5 mi away @ 37550 ft, heading W at 511 mph. Spotted once before! [06:54:42 PM CDT] #AD2733 #N947AK #B39M #ALASKA #ASA485 #AS485 #ADSB #ADSBbot

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

🇺🇸 N921AK - Boeing 737MAX 9 - Alaska Airlines ASA485/AS485, Charleston Afb/International (CHS) to Seattle-Tacoma (SEA) - 11.1 mi away @ 33750 ft, heading WNW at 530 mph. Spotted 6x before! [07:28:29 PM CDT] #ACC1EB #N921AK #B39M #ALASKA #ASA485 #AS485 #ADSB #ADSBbot