and rudders, are checked for irregularities and problems. At the interval of eight months, a plane is checked for its internal controls, hydraulic systems, and emergency equipment. Every twelve to seventeen months the mechanics use sophisticated tools to check for wear, corrosion, and cracks in the surface of the plane, this could not have been detected with the naked eye. Every three to five years each plane is taken apart and put back together. All of the major components are replaced and everything is check for wear and tear.
             With the increase of the use of technology on airplanes, most pilots do not have much to do on their trans-continental flights. Current FAA regulations limit pilots to eight hours of flying a day, provided that they get eight hours of rest on the sam
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