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

🇬🇧 G-STBM - Boeing 777 300ER - British Airways BAW97A/BA97A, London Heathrow (LHR) to George Bush Intcntl/Houston (IAH) - 4.4 mi away @ 37850 ft, heading SSW at 561 mph. Spotted for first time! [06:08:44 PM CDT] #407992 #G_STBM #B77W #SPEEDBIRD #BAW97A #BA97A #ADSB #ADSBbot