I can always remember when, the NASA, aircraft came ove to the UK, with the Space shuttle, and the 'piggy back' came along the river thames, it was a glorius site, and to this day, l am 56 years old, and how the hell it stayed up in the air, with all that weight, always baffles me, l live very near Heathrow, and l still stand in amazment, on how planes stay up, totally unbelievable, good photos as well.