JF-17 fighter jets from Pakistani Air Force escort the plane of Chinese President Xi Jinping, as it enters Pakistani air space on Monday, April 20, 2015. Pakistan is the first stop of Xi's first overseas trip this year. It is a diplomatic etiquette commonly adopted by countries to escort a foreign leader's plane with fighters during a state visit, aimed at showing the importance attached by them to the visit and paying homage to their distinguished guests. (Photo: China News Service/Ouyang kaiyu)
