"The final rule to prevent "widespread fatigue damage" requires aircraft makers and airlines to establish the number of takeoff-and-landing cycles or the number of hours a plane can operate without risk of fatigue damage. After the limit is established the rule will prevent airlines from flying the aircraft past that point unless they receive an extension."

Well, this could be interesting for FedEx since most of our 757's have more hours and cycles than our 727's....but, I assume we would get an extension.

Interesting nonetheless...

FAA moving to prevent aging aircraft dangers - CNN.com