Well, we've come a long way since the Wright Brothers and the guys in this video prove it in a death-defying way.
Two stuntmen wearing wingsuits jumped out of a small plane and tore through the skies over Rio de Janeiro like Superman, filming it all with helmet cams.
Jokke Sommer of Norway and Ludovic Woerth of France didn't have permission to do the stunt, which is illegal.
They did it at 5:45 am giving them just 20 minutes before the first commercial air flight would be in the skies over Rio.
If that's not enough, they flew between a pair of 36-storey corporate office towers, only 8 metres apart (26 feet).
Here's a shot as they approach the towers; note the tiny blue man closing in on the right tower
Sommer, a professional parachuter, told ABC News they "measured the distance from where we had to be dropped, at what altitude and how much the distance from this exact point to the building."
They landed in a normally busy public square.
This is a shot as they fly between the two towers
Sommer and Woerth wore specially designed wingsuits, which have wings that inflate according to relative wind speed. According to the Fly Like Brick Skydiving team, wingsuits are "shaped just like an airplane wing, providing lift and enabling the pilot to glide vast distances across the skies".
But before you book your ticket, this requires a lot of experience. Sommer and Woerth have done this kind of thing before.
And in most places, you have to do at 200 skydives before you can try soaring in a suit. Some countries require 500 jumps.
The average speed of a wingsuit is between 120 and 160 km/h.
According to the Guinness Book of Records, the top speed in one of the suits is a whopping 363 km/h (225.6 mph), by Japanese flier Shinichi Ito over Yolo County, California in 2011.
Sommer hopes his next stunt will involve the Manhattan skyline: "I would love to come to New York and fly. That is beyond my biggest dream."