'Largest aircraft in the world' seen over US. What is it doing?

Pathfinder 1 looks like a blimp, but much bigger. It's part of a wave of interest in "lighter-than-air" or LTA aircraft.
United States Army

Low-cost combat attack system tested at U.S. Army Yuma Proving Ground

The Army is rapidly integrating layered unmanned aerial systems (UAS) and launched effects in a combined arms fight with fires and maneuver to ...
The National Interest

NASA’s X-59 Quiet Supersonic Plane Just Made Its First Flight

The X-59 is designed to transform the sonic boom associated with supersonic flight into a “sonic thump”—making it feasible to fly over populated areas.
bobsurgranny on MSN

RAF C-130 Hercules Low-Level Flyby Through Narrow Valley

I caught the RAF C-130 Hercules making an epic low-level flyby through the narrow valleys of the Mach Loop in Wales. In this ...