Written By: Ben Cosgrove

They’re out there: weirdly shaped vessels and creatures in strange garb, flying often silently above the earth, their purpose a riddle; their means of propulsion and navigation a mystery; their ultimate ambition and destination an enigma.

Wait. We meant to say “reportedly.” Reportedly they’re out there unidentified flying objects, perhaps from other solar systems, other galaxies, other civilizations, checking us out, gauging whether we humans are advanced enough to contact and parley with. (Or, depending on how pessimistic one is about both human and extraterrestrial nature, they’re mulling whether we’re ripe for enslavement, or tasty enough to be made into a kind of galactic goulash.)

[MORE: Read Lev Grossman’s TIME cover story on “what happens when drones return home” to America]

This gallery, meanwhile, isn’t about the technical specs of those hypothetical alien vessels or the possible temperaments or appetites of their purely conjectural pilots. Instead, LIFE.com celebrates readily identifiable, albeit unusual flying objects made locally that is to say, here on Earth: blimps big and small; early helicopters; jet packs; and other devices that, through the years, have helped humanity, if only for a moment, slip the bonds of earth or return safely to the ground after ascending into the sky.

So, it turns out that the rumors and the whispers are true. They’re out there, all right: weirdly shaped vessels and (our fellow) creatures in strange garb, floating and soaring above the earth. And until ET makes a confirmed, documented, verifiable landing hereabouts, we’ll stick with singing the praises of the flying machines and other inventions that, through the years, have been conceived and built by our fellow earthlings.

Slinky-like light pattern produced by light-tipped rotor blades of a helicopter as it takes off into the dark sky, 1949.

Helicopter 1949

Andreas Feininger The LIFE Picture Collection/Getty Images

Ascending gondola trailing disk-shaped radio antenna during lift-off for high-altitude flight to observe the planet Venus, 1959.

Gondola, 1959

Michael Rougier The LIFE Picture Collection/Getty Images

Amphibious U.S. Navy plane, 1940.

Amphibious US Navy Plane 1940

Carl Mydans The LIFE Picture Collection/Getty Images

A "K190" helicopter attempting a three-point landing atop the heads of three women holding plywood squares as landing "pads," 1948.

K190 Helicopter 1948

Bernard Hoffman The LIFE Picture Collection/Getty Images

A man drops a briefcase into the basket on the nose of a helicopter, 1942.

Helicopter, 1942

Dmitri Kessel The LIFE Picture Collection/Getty Images

A parachute jumper testing equipment for the Irving Air Chute Co. gets some help while struggling to reel in his billowing chute, 1937.

Parachute jumper testing equipment 1937

Margaret Bourke-White The LIFE Picture Collection/Getty Images

Children try to catch toys that were released by a kite, 1949.

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Bernard Hoffman The LIFE Picture Collection/Getty Images

Stunt man Jack Wylie soars over the Chicago River, 1958.

Stunt man Jack Wylie, Chicago 1958

Al Fenn The LIFE Picture Collection/Getty Images

Test flight of the "strap-on" helicopter, 1957.

“Strap-on” type of helicopter 1957

Ralph Crane The LIFE Picture Collection/Getty Images

Flying platform being tested at an Air Force base, 1956.

Flying platforms being tested at an Air Force Base 1956

Nat Farbman The LIFE Picture Collection/Getty Images

Bell engineer Harold Graham demonstrating the "Rocket Belt" at Fort Bragg in 1961.

Rocket Belt at Fort Bragg 1961

Ed Clark The LIFE Picture Collection/Getty Images

Balloon being inflated in preparation for high-altitude ascent, 1959.

Balloon 1959

Michael Rougier The LIFE Picture Collection/Getty Images

American paratroopers landing in Korea, with one ripped chute still holding enough air to drop safely, 1950.

Paratroopers 1950

Howard Sochurek The LIFE Picture Collection/Getty Images

A blimp above New York, 1961.

NYC, blimp, 1961

Howard Sochurek The LIFE Picture Collection/Getty Images

A plane swerves toward LIFE photographer Allan Grant as one rocket motor fails to start, 1949.

Airplane 1949

Allan Grant The LIFE Picture Collection/Getty Images

The "Pulsa," a collapsible one-man helicopter, 1952.

Pulsa, 1952

J. R. Eyerman The LIFE Picture Collection/Getty Images

Men anchor a huge balloon, 1941.

Balloon 1941

John Phillips The LIFE Picture Collection/Getty Images

An observation balloon spotting for a 155mm gun at Fort Bragg, 1940.

Fort Bragg 1940

David E. Scherman The LIFE Picture Collection/Getty Images

A blimp lands at a Naval air station in 1942.

US Naval Air Station 1942

William C. Shrout The LIFE Picture Collection/Getty Images

Model of the "Space Ark" rocket ship from the sci-fi classic, "When Worlds Collide" 1951

When Worlds Collide

Allan Grant The LIFE Picture Collection/Getty Images

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