MCCONNELL AIR FORCE BASE, Kan.— In 2016, the B-29 Superfortress known as Doc took to the skies for the first time in 60 years from McConnell’s runway. This year, it will be showing off at the base in a different way.Doc is scheduled to be one of many attractions at the Frontiers in Flight Open House and Air Show Sept. 8-9. During the event, the