We have seen of late years, in such matters as wireless or heavier-than-air machines, that the most unlikely things may come to pass.

This is the first known flight by a person in a heavier-than-air machine.

When they were published in 1797, the reaction was unanimous that heavier-than-air machines could never leave the ground.

The first known use of a heavier-than-air machine occurred on 3 August 1921.

This was considered to be the first pre-announced public flight of a heavier-than-air flying machine in America.

A heavier-than-air flying machine is a paradox in itself.

He met with considerable skepticism from people who believed that a heavier-than-air machine could not fly.

At his death he was hailed as the father of aviation and the heavier-than-air flying machine.

The aircraft was the first powered, heavier-than-air machine to fly in Canada.

Patrick Alexander was very interested in the development of heavier-than-air flying machines.