An ancient engineering class question asked what was the 'perfect' design. The answer was a single ball bearing. Two or more put together would require some type inspection sooner or later. The point that followed was that aircraft inspections are simply engineering's inability to perfect something and it therefore needs to be looked after forever (via timed inspections).
It can then be assumed that once engineers redesign out the 'inperfection' and it is made 'perfect', then the inspection can go away and without any aircraft inspections, you would theoretically have the 'perfect aircraft'.
A lawn dart might just qualify.