They are safer and stronger than most sheet-metal modern airplanes, and all that's needed is a license and a farmer's permission.

However all of these aircraft were obsolete by the time they came into service, and development of more modern airplanes continued.

"Basically, the vehicle flies itself and does its own management and testing, like a modern airplane," Mr. Klevatt said.

Cayley proposed an aircraft with a "fixed wing and a horizontal and vertical tail," defining characteristics of the modern airplane.

The Army went over to the Nationalists, but it was very poorly equipped--there were no tanks or modern airplanes.

Besides a material loss of a handful of modern airplanes that had been destroyed on the airfield during the siege.

The least reliable component of a modern airplane is its pilot.

With sustainable growth Tikal Jets Airlines had been able to acquire modern and larger airplanes.

But not too much wind; if the gusts get up above 25 m.p.h. the pilot cannot reduce engine power as would be done in a modern airplane.

Economic sanctions hobble the country's economic development, limiting foreign investment and curbing access to much needed equipment like modern airplanes and computers.