National US Air Force Museum provides unique Air Force One history

Walking into the National Museum of the US Air Force is to step back in time.The $40 million hanger houses the largest collection of historical presidential aircraft anywhere."There is nowhere else in the world when you can see a collection of presidential aircraft," Curator Christina Douglass said.From the first aircraft, known as the "Sacred Cow," it flew 32nd President Franklin D. Roosevelt. It took flight in 1943 and was modified with a lift to accommodate his wheel chair.In 1947, President