The Department of Transportation is authorized to build roads to airports and landing fields open to public use, and may pay out of highway funds, which have been allocated by the Commonwealth Transportation Board, the cost of such roads. The Department of Transportation may, in cooperation with the Department of Aviation and either on an actual cost or contract basis, construct, maintain and improve airports, landing fields and other aviation facilities licensed for public use, the actual cost thereof to the Department of Transportation to be paid by the Department of Aviation.