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

🇺🇸 N723AL - BOEING 737 MAX 9 - ALASKA AIRLINES INC ASA1457/AS1457, San Diego (SAN) to General Edward Lawrence Logan (BOS) - 3.9 mi away @ 35300 ft, heading ENE at 683 mph. Spotted 2x before. [02:51:15 AM CST] #A9AEBC #N723AL #B39M #ASA1457 #AS1457 #ADSB #ADSBbot