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

Every year, more and more aircraft and put into service, and these five companies are the ones producing the greatest number of aircraft globally.

Stratolaunch may conduct another hypersonic test flight this weekend from California's Mojave Air & Space Port. The flights are part of a Department of Defense program to test advanced capabilities ...