Higher-Airspace Operations Garner Renewed Attention

higher-airspace airship Stratobus concept
Credit: Thales Alenia Space
The layer of atmosphere between 20 km and100 km (66,000-330,000 ft.) used to be of little interest. Air-breathing engines could only help aircraft reach lower altitudes, except for a few prototypes or rare military aircraft, such as the Lockheed U-2 reconnaissance jet. As a result, the higher...

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