I'm pretty sure the FAA has very stringent maintenance requirements. I remember reading an article in one of the local papers where they followed along as Frontier Airlines went through a major maintenance on a 737 that was only a year away from being retired. I don't remember exactly how much the maintenance cost, but I think I remember it being in the high six figures, low seven figures. Crazy money for a plane about to be retired, but it was done because it was mandatory for the number of hours on the plane. Also the FAA steps up inspections on airlines known to be in financial trouble.
Also, although none of the investigations are complete yet, it doesn't appear that any of the three recent commercial aviation incidents are the result of mechanical failures.
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