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

🇺🇸 N433AS - Boeing 737NG 990ER/W - Alaska Airlines ASA856/AS856, Los Angeles (LAX) to Washington Dulles (IAD) - 4.5 mi away @ 33675 ft, heading E at 645 mph. Spotted 8x before! [01:13:41 PM CDT] #A52E54 #N433AS #B739 #ALASKA #ASA856 #AS856 #ADSB #ADSBbot