The Boeing HALE is a concept for High Altitude, Long Endurance unmanned aerial vehicles.
Two demonstration HALE aircraft are currently under development:
The HALE concept for surveillance missions includes flight altitudes above 65,000 ft, for endurance periods of days, months and even years – far beyond the 30 hour endurance of RQ-4 Global Hawk.
- Haddox, Chris. "SolarEagle (Vulture II) Backgrounder" Boeing Phantom Works, September 2010. Retrieved: 18 October 2010.
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