docrichard's link of the KC135 (if that's what it is) begs the question of the conspiracy nuts who say a plane can't fly that fast that low because of some aerodynamic effect so a plane didn't hit the Pentagon. That plane is going faster than take off speed. Then the fighter jocks are really shifting, really low!
Sorry, conspiracy kno88ers, my pet dislike. Seadog dismounts hobby horse and takes medication.
I knew they could fly fast and low before any of the vids posted here and I'd heard the expression 'ground effect'. The Lynx film is impressive but ladies prefer fighter pilots. (So fighter pilots and ladies tell me).