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

🇺🇸 N442AS - Boeing 737NG 990ER/W - Alaska Airlines ASA221/AS221, Newark Liberty (EWR) to San Francisco (SFO) - 4.3 mi away @ 35175 ft, heading WSW at 444 mph. Spotted 3x before! [12:15:38 AM CDT] #A5521C #N442AS #B739 #ALASKA #ASA221 #AS221 #ADSB #ADSBbot