Qin Si serves a passenger on board their flight, Jan 25, 2017. Qin, a post-1990s flight attendant with China Southern Airlines, will work her second Spring Festival travel rush this year. [Photo/Xinhua]

Spring Festival, or the Chinese Lunar New Year, is the most important occasion in the Chinese calendar. This year it falls on Jan 28.

About 3 billion trips are expected to be made during chunyun, the Spring Festival travel rush that lasts this year from Jan 13 to Feb 21, the National Development and Reform Commission said.

Many employees work day and night to ensure smooth operations during the travel rush. Let's take a look at the people behind chunyun.