The latest attempt to refloat a ship used to ferry aircraft wings stuck on a sandbank in the Dee estuary has failed.

BBC: Airbus wings ship Ciudad de Cadiz refloat bid fails again

Built for American Airlines, NASA acquired the aircraft in 1974 and used it for test flights from Edwards Air Force Base in California's Mojave Desert and ferry flights to the Kennedy Space Center in Florida.

MSN: What it's like to fly a plane carrying shuttle - Technology & science - Space | NBC News