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Although the wreckage was spotted by high-altitude aircraft, no one has been allowed near the site in an area presumed to be controlled by guerrillas.

This program focused on producing a missile which could bring down a large, non-maneuvering, high-altitude aircraft.

Later generations invented pressure suits and high-altitude aircraft.

Some entrepreneurs were so optimistic that they suggested sending high-altitude aircraft to circle above big cities, beaming signals down to consumers.

Venture capitalists began financing companies with plans to deliver data quickly to computer users in other ways, like using satellites and even high-altitude aircraft.

The air campaign has been conducted until now using cruise missiles and precision-guided bombs dropped from high-altitude aircraft.

This means that a high-altitude aircraft is only visible to the operator in a narrow ring at the extreme outside of the scope.

A high-speed, high-altitude aircraft might fly over early warning radars without being recognized.

The incident showed that even high-altitude aircraft were vulnerable to missiles.

Prior to his involvement with exploration programs he conducted research on high-altitude unmanned aircraft.