"HK tax is based on the source of the income".

If Cathay flies to PAR or AMS or wherever, benefitting from traffic from that local market, then what really is the true source of the income? It's PAR or AMS, not HKG.

The bases are closing because CX wants its cake and eat it too... And local govt said no. If you want to benefit with landing rights, then there should be a giveback to the community. Supporting local infrastructure is one way. Otherwise might as well give all the landing rights to EK EY where the customer ultimately gets more for there money.

If people are living in a jurisdiction, they should be subject to supporting the infrastructure there. Full stop.

Quite right. Earlier posting amended above!