The District has the continuing power to borrow money and issue either general obligation bonds as hereinafter provided or revenue bonds as hereinafter provided for the purpose of acquiring, constructing, reconstructing, extending, improving or operating the terminals, terminal facilities, airfields, airports, port facilities, aquariums, museums, planetariums, climatrons and other buildings or facilities which the District has the power to acquire, construct, reconstruct, extend or improve, and for acquiring any property and equipment useful for such construction, reconstruction, extension, improvement or operation, and for acquiring necessary cash working funds.