A 94-year-old Ohio woman who woke up to discover that a breakaway blimp from a nearby airport had landed in her backyard said she heard a bang during stormy weather but didn’t realize what had happened until police knocked on her door about seven hours later. The 128-foot -long blimp broke free of its moorings at a Columbus airport during strong winds early Sunday, then drifted to the sky, headed eastward and landed in Lillian Bernhagen’s backyard in Worthington, less than two miles from Ohio State University’s Don Scott airfield.