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

🇬🇧 G-ZBLB - Boeing 787 10 - British Airways BAW26E/BA26E, London Heathrow (LHR) to George Bush Intcntl/Houston (IAH) - 29.5 mi away @ 39975 ft, heading SSW at 548 mph. Spotted 2x before! [11:38:20 AM CDT] #4078DE #G_ZBLB #B78X #SPEEDBIRD #BAW26E #BA26E #autopilot #ADSB #ADSBbot