Air Force One, in Riyadh, Saudi Arabia. 空軍一號

Air Force One transporting U.S. President Barack Obama and First Lady Michelle Obama flies over the desert as they prepare to land at King Khalid International Airport in Riyadh, Saudi Arabia.
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January 27, 2015
http://www.voanews.com/media/photogallery/january-27-2015-day-in-photos/2615736.html

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Through The Lens - The Straits Times
http://www.straitstimes.com/ttl

Air Force One - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Air_Force_One
空軍一號 - 維基百科，自由的百科全書
空軍一號（Air Force One）
無線電台呼號
call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call)
http://zh.wikipedia.org/wiki/%E7%A9%BA%E5%86%9B%E4%B8%80%E5%8F%B7
Call sign - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Call_sign
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