"Better than buying a replacement" - Really?? The thing is over 50 years old. Remember your mechanics of materials class, and how fatigue affects aluminum? Here we have the backbone of the nation's heavy bombing force, the B-52, and all of them are well beyond the age any commercial heavy jet would have been retired by. Sure, they have all been re-built several times, but at what point do you just bite the bullet and pay for an entirely new plane? These things were originally designed in the late 1940s, ferchristsake.