On this relatively new route it appears Hainan is trying to generate some business for the upfront cabin during the summer season when more families tend to travel economy rather then people flying for work in business class. The offer states that if you buy a business class ticket you can get another one free, or if you buy two business class tickets you can still get one free(?). So if you have a family of four and you want to take advantage of this offer you may want to do two separate bookings to get two free business class tickets. Either way this is not a bad deal and may allow for some people to travel upfront who normally would not. The offer itself runs until August 31. For full details please see the promotional offer on Hainan’s website