Air Quote by Simon Newcomb

Heavier-than-air flying machines are impossible.

— Lord Kelvin

Flight is intolerable contradiction.

— Muriel Rukeyser

One: There is a low limit of weight [of about] 50 pounds beyond which it is impossible for an animal to fly. Two: The…

— Joseph LeConte

Is it not demonstrated that a true flying machine, self-raising, self-sustaining, self-propelling, is physically impossible?

— Joseph LeConte

This machine was a failure to the extent that it could not fly. In other respects it was a very important and necessary stepping…

— Igor Sikorsky

It is difficult to fly without wings.

— Plautus

It is possible to fly without motors, but not without knowledge and skill.

— Wilbur Wright

It's a hard to fly when something is weighing you down...

— Ritu Ghatourey

Flying cars are not a very efficient way to move things from one point to another.

— Bill Gates

Well, gentlemen, do you believe in the possibility of aerial locomotion by machines heavier than air? ... You ask yourselves doubtless if this apparatus,…

— Jules Verne

Flying does not rely so much on strength, as on physical and mental co-ordination.

— Raymonde de Laroche

With all the knowledge and skill acquired in thousands of flights in the last ten years, I would hardly think today of making my…

— Orville Wright