Well I speak with no authority whatsoever and this is completely my own conjecture. But I would agree that CNS may be a base QF would not want to hang onto. Jetstar have a base there and fly to two JPN destinations. Why bother running a QF plane to Narita for a leisure market that's seen better days? Japanese tourists are falling off like flies to CNS preferring instead SE Asia because of the favourable exchange rate. Not a lot of business flying done in and out of CNS.