Company A, 5th Battalion, 159th Aviation Regiment, conducts high-altitude search-and-rescue operations.

The 4th is best suited for high-altitude operations.

Second and first prototypes respectively: three were built, designed for pressurised, high-altitude operations using turbocharged Hercules VIII engines.

Thus hot-temperature or high-altitude operations have a considerable degree of confidence.

Fighters were usually optimized for high-altitude operations without bombs or other external ordnance - flying at low level with bombs quickly expended fuel.

The Fortress I was unsuitable for the type of very high-altitude operations by small formations on which the RAF used them.

This was pressurised for high-altitude operations.

Intended for high-altitude operations, the aircraft was equipped with a far more powerful engine than its predecessors.

It had an additional super-charger on each engine for high-altitude operations, an oxygen system, pressurized flight and crew compartment and various other bells and whistles.

This was no supercharged engine designed for high-altitude operation and the vehicle could not be making more than six or seven miles an hour up the steep slopes of the road.