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

🇳🇱 PH-BQI - Boeing 777 206ER - KLM Royal Dutch Airlines KLM661/KL661, Amsterdam Schiphol (AMS) to George Bush Intcntl/Houston (IAH) - 7.4 mi away @ 39725 ft, heading S at 520 mph. Spotted for first time! [11:43:30 AM CDT] #484370 #PH_BQI #B772 #KLM #KLM661 #KL661 #ADSB #ADSBbot