It is a huge burden on the Cornish council tax payer but there is a degree of pride involved in retaining an independent commercial airport for the people of Cornwall. Someone needs to ask the question - how much would be knocked off each council tax bill if the airport was disposed of (and all the EU grants paid back presumably). Stack that up against the supposed economic benefit to the local area of having it there.
They should sell it. Only Gloucestershire and Newquay really still out there ready to be sold off - two quite different assets but both should be sold off and run privately.