Their Planes Are Old
It's stretching the truth to say that some commercial airplanes are older than their pilots -- unless you look at age in miles and years. Just recently, a hole opened in the fuselage of a Boeing 737-300 during flight. The plane made a successful emergency landing, but subsequent FAA inspections revealed the plane had made over 40,000 flights -- more than seven flights per day during its 15 years in service.
Since a full inspection of an airplane's fuselage requires an electromagnetic device and takes a month to complete, inspections are usually limited to a few sections of the outer skin.