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

🇳🇱 PH-BHE - Boeing 787 9 - KLM Royal Dutch Airlines KLM661/KL661, Amsterdam Schiphol (AMS) to George Bush Intcntl/Houston (IAH) - 5.5 mi away @ 35375 ft, heading SSW at 530 mph. Spotted once before. [11:29:59 AM CST] #4851B0 #PH_BHE #B789 #KLM #KLM661 #KL661 #autopilot #ADSB #ADSBbot