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

🇳🇱 PH-AKF - Airbus A330 303 - KLM Royal Dutch Airlines KLM661/KL661, Amsterdam Schiphol (AMS) to George Bush Intcntl/Houston (IAH) - 4.7 mi away @ 40000 ft, heading SSW at 448 mph. Spotted 5x before! [12:21:43 PM CST] #4850E6 #PH_AKF #A333 #KLM #KLM661 #KL661 #ADSB #ADSBbot