The Air Force is studying whether Lockheed Martin's U-2 can fly until 2100, about five decades longer than its current expected service life, according to Susan Thornton, director for information dominance programs in the service's acquisition branch. "The U-2s are pretty much rebuilt every seven years," she said at a March 15 House Armed Services tactical air and land forces subcommittee hearing. "So right now, they have a life out to 2055, but we are also investing in a structural...