What a suprise.
The island needs the airport, the airport needs the island.
Until the Channel Islands decide to ditch Alderney, the States will have an obligation to ensure that they maintain public services across the board.
If they are really feeling the pinch in Jersey because of Alderney Airport it's a very sad day which will be easily rectified by extracting another penney or so from the poor little dears who live there for tax reasons alone.