Unfortunately much of what HKA has on order is not really what CX would want apart from A350s and with demand worldwide high for 350s I doubt any slots would be at much of a bargain although the slots in themselves would be in demand. HKA do not currently operate any aircraft that CX would want either and as for suddenly picking up HKA's business, considering where they fly to and how often and the yields of those passengers I don't think it would make much difference either!