Though it has been said on here that Douglas aircraft are "built like tanks", I was curious what kind of fatigue life is expected of them. DAS Air Cargo is currently offering a DC-10F for lease with 120,000 (!!!) hours on it. I have also seen a former CO bird with 115,000 on it. Just curious since 100,000 seems to be the magic number on te 747 before wing spars come due for an expensive replacement.