Pathfinder 1 looks like a blimp, but much bigger. It's part of a wave of interest in "lighter-than-air" or LTA aircraft.
A startup from Boulder, Colorado, is pitching what it calls the world's largest aircraft by volume, a plane so massive it could carry four F-35 stealth fighters or six CH-47 Chinook helicopters ...
Stratolaunch previously announced it received $24.7 million from the Missile Defense Agency for a hypersonic flight test ...
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