The B-52H fleet, already nearly 60 years old, has been the recipient of a steady but slow stream of upgrades to keep the planes useful. The Air Force is now committing to flying the bomber into the 2050s, a feat that will require even more improvements. The U.S. Air Force ordered 102 B-52H bombers during the Cold War, with the first planes delivered in May 1961. The old eight-engined warhorse has been in continuous service ever since, flying combat missions over the former Yugoslavia, Iraq, and Afghanistan. The Air Force plans to keep flying the remaining 76 B-52Hs through 2050,...