Unless China will permit CX to use Shenzhen as a secondary hub, there won't be any real benefits for HK to integrate more with Shenzhen. In fact, Shenzhen will steal more pax away from HKG (if not already.) A third runway is a must for CX, KA, HX, and others to have a meaningful chance of competition against up and raisers in Shenzhen and Zhu Hai.