I say again: if I were to propose a large hike in council tax, or a large cut in other services, so as to be able to subsidise a municipal airport, then guess what ... I'd lose my seat, and not be in a position to implement such a policy.
It's called "democracy". It's the UK voters who don't want to subsidise what they see as a rich man's hobby. One can only assume that voters in other countries take a different view.