Discovery piggy-backs on 747 and makes Washington flypast
17 April 2012 Last updated at 16:39 BST
One of Nasa's iconic space shuttles has made a dramatic flypast over the centre of the US capital on the way to its final resting place in a museum.
After circling four times over the Washington Monument, and passing the National Mall over Capitol Hill, Discovery landed at Dulles Airport, a few miles outside Washington DC.
Robert Massey, from the Royal Astronomical Society, explained the significance of the Discovery shuttle.