Speaking of longevity of the CFM-56 engines, am I correct in my memory that I've read somewhere that a CFM-56 engine is responsible for operating the highest number of hours without being removed for attention? I can't remember the exact figure, so I won't guess, but it was astonishing, even to a layperson
Some interesting facts and figures on the CFM website for those interested
http://www.cfm56.com/index.php