Comparing car design and operating conditions to that of airplanes is kind of silly. The operating conditions of aircraft are far better defined and restricted.

Comparing car design and operating conditions to that of airplanes is kind of silly. The operating conditions of aircraft are far better defined and restricted. Additionally, aircraft airframes are regularly inspected and fully radiographed at certain intervals. Components that develop flaws are changed out when the flaws are detected. The same is not true of cars.