Mechanical engineers examine airplanes to ensure safety in China's Wuhan

Mechanical engineers of China Southern Airlines examine a Boeing 737 in Wuhan, capital of central China's Hubei Province, Jan. 20, 2017. In order to ensure the safety and efficiency of the flights during the Spring Festivel travel rush, mechanical engineers of China Southern Airlines have been working day and night to examine the airplanes since the travel rush began. (Xinhua/Cheng Min)