ecblackiii wrote:
Pilots need not worry about the age or metal fatigue. The B-52s were built to last and have been renovated to install modern navigation systems, radar, electronic jamming and other protection systems. The metal fatigue and systems wear is taken care of in periodic depot maintenance, which tears down the plane to inspect and replace anything worn that matters to safety of flight, including the frame and skin. But they are fuel hogs, and are expensive to fly and maintain at the level required.
I suppose the military planes are built better, and maintenance is a priority. It was metal fatigue that did in the Dehavilland Comet. They started falling from the sky, but no one knew why.