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

🇺🇸 N533AS - Boeing 737NG 890/W - Alaska Airlines ASA9431/AS9431 - 5.2 mi away @ 42025 ft, heading NW at 491 mph. Spotted 4x before! [10:09:35 AM CDT] #A6BBA3 #N533AS #B738 #ALASKA #ASA9431 #AS9431 #ADSB #ADSBbot