The U.S. Navy has quietly written a small but telling check to a company working on a solar‑electric aircraft that can stay ...

In a series of videos that surfaced online, eagle-eyed observers filmed a huge aircraft, likened to that which you might expect in a "science fiction novel" ...

While a strange craft resembling two passenger jets fused together was recently spotted over California, it's not a UFO (or ...

These are an ongoing series of extraordinary aircraft existing at the extreme cutting edge of technology. The “X-planes” are ...

The Northrop X-4 Bantam had a tendency to pitch nose-down at high speeds—generally not a desirable condition for a plane. Experimental aircraft—usually designated by “X” markings in U.S. aircraft ...