The Cape May county commissioners have approved a memorandum of understanding with the Delaware River and Bay Authority for construction of a new hangar at Cape May Airport, the latest development in the county’s takeover of the airport site.Earlier this summer, the commissioners awarded a bid to the current airport operator under the DRBA, FlightLevel Aviation, to continue in that role after the county assumes control from the DRBA, the leaseholder and manager of the 1,000-acre property, in about four years.