High-altitude Platform
A high-altitude platform (HAP) is a quasi-stationary aircraft that provides means of delivering a service to a large area while staying thousands of feet above in the air for long periods of time. A HAP differs from other aircraft in the sense that it is specially designed to operate at a very high altitude (17–22 km) and is able to stay there for hours, even days. The new generation of HAPs, however, will expand this period to several years.
Read more about High-altitude Platform: Limitation Due To Power, Altitude Selection For HAPs, Comparison To Satellites, Applications, See Also
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—Henry David Thoreau (1817–1862)