Militant Islamist fighters take part in a military parade along the streets of Syria's northern Raqqa province June 30, 2014. The fighters held the parade to celebrate their declaration of an Islamic “caliphate” after the group captured territory in neighbouring Iraq, a monitoring service said. The Islamic State, an al Qaeda offshoot previously known as Islamic State in Iraq and the Levant (ISIL), posted pictures online on Sunday of people waving black flags from cars and holding guns in the air, the SITE monitoring service said. (Photo by Reuters/Stringer)

First class seat of Emirates Airbus A380 registration A6-EDP at Munich Airport Franz Joseph Strauss on November 25, 2011 in Munich, Germany. Emirates Airlines has launched a new daily A380 service from Dubai to Munich with its first flight. (Photo by Alexander Hassenstein/Getty Images)

Chinese female weightlifter Xiang Yanmei, who competes in the 69 kg weightclass, rests with a weight on her stomach as she checks her phone during a training session in preparation for the Rio Olympics at the Training Center of General Administration of Sports in China on July 20, 2016 in Beijing, China. Xiang Yanmei won the World Championships in 2013 and 2015. (Photo by Kevin Frayer/Getty Images)

People walk on a sightseeing platform in Zhangjiajie, Hunan Province, China, August 1, 2016. China has opened a 100-metre-long glass skywalk stretching around a cliff on the side of the Tianmen Mountain. The skywalk provides a view of a 300-metre drop and overlooks Tongtian Avenue, a mountain road with 99 turns that snakes up the mountain. When translated in English, it means “Avenue to the Sky”. (Photo by Reuters/Stringer)

A model presents a creation by Chinese designer Hu Sheguang from Sheguang Hu collection at China Fashion Week in Beijing, March 31, 2016. (Photo by Jason Lee/Reuters)

Children play inside China's first official Hello Kitty restaurant in Shanghai, China, April 9, 2016. Mainland China's first official Hello Kitty-themed restaurant has opened its doors to customers in Shanghai, serving a variety of food with the famed kitten character’s designs. Hello Kitty Bistro Bianco comes after the opening of Hong Kong's official Hello Kitty restaurant last year and the Hello Kitty theme park in Zhejiang province. (Photo by Aly Song/Reuters)

Sichuan Opera performer Wu Yonghong, 26 years, of the Jinyuan Opera Company performs for villagers at the Dongyue Temple on May 2, 2016 in Cangshan, Sichuan province, China. Sichuan opera is a vibrant, centuries-old tradition that showcases the joys and challenges of daily life in rural China with tales of love, tradition, and family honor. Photo by Kevin Frayer/Getty Images)