The Aging Plane Issue. Is it really an Issue?

Aviation Experts Say Aging U.S. Planes Are Crippling Airlines This Story in Abc News recently reports on the delays from AA due to its last minute inspections of the MD aircraft it has.

Why is this restricted to AA. Is there some maintenance issue that AA has with these aircraft that is peculiar to them and no other carriers, or are they just the only carrier.

Lots of these flying around asia, I wonder if we will see the issues spreading ..