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

🇳🇱 PH-BKF - Boeing 787 10 - KLM Royal Dutch Airlines KLM661/KL661, Amsterdam Schiphol (AMS) to George Bush Intcntl/Houston (IAH) - 12.1 mi away @ 38375 ft, heading SSW at 568 mph. Spotted for first time! [11:20:13 AM CST] #485B45 #PH_BKF #B78X #KLM #KLM661 #KL661 #autopilot #ADSB #ADSBbot