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

🇳🇱 PH-BQN - Boeing 777 206ER - KLM Royal Dutch Airlines KLM661/KL661, Amsterdam Schiphol (AMS) to George Bush Intcntl/Houston (IAH) - 36.1 mi away @ 39100 ft, heading SSW at 569 mph. Spotted for first time! [11:08:29 AM CST] #4841AD #PH_BQN #B772 #KLM #KLM661 #KL661 #ADSB #ADSBbot