It has been called the biggest human migration in the world. Millions of people in China have now begun to head back to work from their Spring Festival holiday.

CCTV’s Nie Jia filed this report.

Some major highways and airports in China are blocked due to heavy snow in the north, causing severe delays.

There were about 250,000 airline passengers attempting to fly out out on Sunday, marking a 13 percent increase from last year. At Haikou International Airport in south China there were 600 flights on Sunday alone, setting a record there.

“Every hour we have 27 flights and 30 per hour at peak time, meaning we have a flight taking off or landing every two minutes.” Wu Tao, Section Chief for the Civil Aviation Administration said.

Weather is hampering travel in a much larger way in Heilongjiang province in the north as heavy snow blocked airports and highways.

“We arrived at 8 a.m., but the flight kept delaying and now the whole airport is shut down,” one traveler told CCTV.

The heavy snow has put more strain on the already stretched railway network in the north as air and highway passengers change their mode of transport.

“I can only choose rail now because the airports and highways are sealed off,” passenger Lv Guijuan at Harbin Taiping International Airport said.

According to the China Railway Bureau, railways across China saw over 6.6 million passengers on Sunday, which is one million more than the same day last year. Continuous downpours in many regions south of the Yangtze River have only caused more problems.

China’s Spring Festival holiday still has two more days left and the busy traffic and rail flows are set to continue right through until Wednesday.