🇺🇸 N478AS - Boeing 737NG 990ER/W - Alaska Airlines ASA1318/AS1318, St Louis Lambert (STL) to Portland (PDX) - 3.8 mi away @ 16450 ft, heading NW at 432 mph. Spotted 5x before. [06:32:34 PM CDT] #A5DEE3 #N478AS #B739 #ALASKA #ASA1318 #AS1318 #Departure #ADSB #ADSBbot