1 Aeroplanes shall give way to power -driven heavier-than-air aircraft.

2 Power -driven heavier-than-air aircraft shall give way to gliders.

3 Heavier-than-air flying machines are impossible.

4 The Wrights had flown a powered, heavier-than-air machine in free, controlled, sustained flight.

5 They flew "the world's first power-driven, heavier-than-air machine in which man made free, controlled, and sustained flight."

6 This was the first flight of a heavier-than-air machine that took off into the air carrying a person, and moved forward to land at a point as high as that from which it had taken off.

7 It wasn't long until the military opened bids for what were then called "heavier-than-air" flying machines. The Wrights signed a contract, and the Military Flyer was born.

8 Heavier-than-air flying machines are impossible. X-rays will prove to be a hoax.

9 "Radio has no future. Heavier-than-air flying machines are impossible. X-rays will prove to be a hoax." — William Thomson, Lord Kelvin, British scientist, 1899.

10 On December 17, 1903, the Wright Brothers embarked on the first sustained, heavier-than-air, man-powered flight aboard the Wright Flyer.

11 Named after Samuel Pierpont Langley (1834-19O6), American astronomer, physicist, and pioneer in the development of heavier-than-air craft.

12 Named after Samuel Pierpont Langley (1834-1906), American astronomer, physicist, and pioneer in the development of heavier-than-air craft.

13 An aircraft towing objects has the right of way over all power - driven heavier-than-air aircraft.