Lancaster and Vulcan bombers unite for Lincoln flypast
22 August 2014 Last updated at 10:22 BST
During the Second World War, Lincolnshire was home to thousands of crew from Bomber Command.
Today, the first turf was cut for a memorial centre which will tell the stories of those involved in the conflict.
To mark the event, the final two airworthy Lancasters flew in formation, along with the last flying Vulcan bomber, over the memorial site at Canwick Hill.
Ed Thomas reports.