Bad move. airfield operations seldom make a significant profit, rather use any non-essential land to generate a long term income which can contribute to the long term viability of the airfield.
Rental properties, sheep, solar panels, cabbages, whatever gives a good return but NEVER sell off bits of land. When its gone its gone and the one off income is soon spent.
One would have thought it might have been possible to build exclusive residential properties, possibly with their own hangarage, to individuals who specifically
want to live adjacent to their own airfield, and who would be willing to enter into a contractual obligation for maintenance of the field as a condition of the purchase.
I know I would.