The planes are going to land at National.......which is not far from Rossyln.......................they are coming down there........following the Potomac river as a guide.....................u can see them really easily at Rosslyn..................final descent before they land.........they are clearly visible in the many glass buildings at Rosslyn.....

www.leonardodavinci.net

Leonardo designed a multitude of mechanical devices, including parachutes, and studied the flight of birds as well as their structure. About 1485 he drew detailed plans for a human-powered ornithopter (a wing-flapping device intended to fly).

Leonardo da Vinci's Flying Machine Invention

www.da-vinci-inventions.com/flying-machine.aspx

Da Vinci seemed truly excited by the possibility of people soaring through the skies like birds. One of da Vinci's most famous inventions, the flying machine (also known as the "ornithopter") ideally displays his powers of observation and imagination, as well as his enthusiasm for the potential of flight.

FLYING MACHINES - Leonardo da Vinci

www.flyingmachines.org/davi.html

Leonardo designed a multitude of mechanical devices, including parachutes, and studied the flight of birds as well as their structure. About 1485 he drew detailed plans for a human-powered ornithopter (a wing-flapping device intended to fly).