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

🇬🇧 G-STBG - Boeing 777 336ER - British Airways BAW97A/BA97A, London Heathrow (LHR) to George Bush Intcntl/Houston (IAH) - 6.0 mi away @ 37975 ft, heading SSW at 529 mph. Spotted once before! [05:13:33 PM CDT] #406947 #G_STBG #B77W #SPEEDBIRD #BAW97A #BA97A #ADSB #ADSBbot