Flying with chinese airlines within 2 weeks before and after can easily mean exspensive tickets as its the biggest movement of people in the world for those few weeks. Flying 2hrs from Shenzhen to Chongqing will cost you 200USD each way during this time of the year. And more chinese are deciding to take overseas trip during the CNY so the demand is high.Of course for non chinese countries it is a boon for business because February (I suppose excluding EU School break) is usually when business is much quieter compared to December or January.