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

🇺🇸 N487AS - Boeing 737NG 990ER/W - Alaska Airlines ASA481/AS481, Orlando (MCO) to Seattle-Tacoma (SEA) - 4.1 mi away @ 34000 ft, heading NW at 479 mph. Spotted 4x before! [12:42:00 PM CST] #A602AB #N487AS #B739 #ALASKA #ASA481 #AS481 #ADSB #ADSBbot