Visitors take a close look at the model of Air Force One during its unveiling ceremony at the Richard Nixon Library & Museum in Yorba Linda, California, Aug. 13, 2013. A new exhibition featuring a 1/20 scale, 7 feet model of Air Force One SAM 26000 was opened here Tuesday. Air Force One SAM 26000 was the plane on which former US President Nixon flew around the world. (Xinhua/Zhao Hanrong)   

Ed Nixon, the younger brother of former US President Nixon speaks during the unveiling ceremony for a model of Air Force One SAM 26000 at the Richard Nixon Library & Museum in Yorba Linda, California, Aug. 13, 2013. A new exhibition featuring a 1/20 scale, 7 feet model of Air Force One SAM 26000 was opened here Tuesday. Air Force One SAM 26000 was the plane on which former US President Nixon flew around the world. (Xinhua/Zhao Hanrong)

Members of U.S. Naval Sea Cadets march during the unveiling ceremony for a model of Air Force One SAM 26000 at the Richard Nixon Library & Museum in Yorba Linda, California, Aug. 13, 2013. A new exhibition featuring a 1/20 scale, 7 feet model of Air Force One SAM 26000 was opened here Tuesday. Air Force One SAM 26000 was the plane on which former US President Nixon flew around the world. (Xinhua/Zhao Hanrong)

A model of Air Force One is seen during its unveiling ceremony at the Richard Nixon Library & Museum in Yorba Linda, California, Aug. 13, 2013. A new exhibition featuring a 1/20 scale, 7 feet model of Air Force One SAM 26000 was opened here Tuesday. Air Force One SAM 26000 was the plane on which former US President Nixon flew around the world. (Xinhua/Zhao Hanrong)

A model of Air Force One is seen during its unveiling ceremony at the Richard Nixon Library & Museum in Yorba Linda, California, Aug. 13, 2013. A new exhibition featuring a 1/20 scale, 7 feet model of Air Force One SAM 26000 was opened here Tuesday. Air Force One SAM 26000 was the plane on which former US President Nixon flew around the world. (Xinhua/Zhao Hanrong)

Visitors take photos of the model of Air Force One after its unveiling ceremony at the Richard Nixon Library & Museum in Yorba Linda, California, Aug. 13, 2013. A new exhibition featuring a 1/20 scale, 7 feet model of Air Force One SAM 26000 was opened here Tuesday. Air Force One SAM 26000 was the plane on which former US President Nixon flew around the world. (Xinhua/Zhao Hanrong)