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

🇬🇧 G-ZBKC - Boeing 787 9 - British Airways BAW26E/BA26E, London Heathrow (LHR) to George Bush Intcntl/Houston (IAH) - 4.6 mi away @ 39775 ft, heading SSW at 523 mph. Spotted once before! [12:46:05 PM CST] #406D79 #G_ZBKC #B789 #SPEEDBIRD #BAW26E #BA26E #autopilot #ADSB #ADSBbot