🇺🇸 N552AS - Boeing 737NG 890/W - Alaska Airlines ASA473/AS473, St Louis Lambert (STL) to Seattle-Tacoma (SEA) - 4.7 mi away @ 13075 ft, heading NW at 406 mph. Spotted 5x before. [06:44:42 AM CDT] #A706EA #N552AS #B738 #ALASKA #ASA473 #AS473 #TakingOff #Departure #ADSB #ADSBbot