A county airport, designed to serve the needs of private aircraft owners, planned to cover its operating expenses in part by charging user fees to private aircraft using the airport. The airport was unable to pay its operating expenses because the revenue from user fees was lower than expected. If the statements above are true, which one of the following must also be true? ['Private aircraft owners were unwilling to pay the user fees charged at the airport.', "The number of owners of private aircraft who use the county's airport facilities will not change appreciably in the future.", "Most of the county's citizens live a convenient distance from one or another airport now offering commercial airline services.", "The airport's operating expenses were greater than the revenue raised from sources other than the airport user fees for private planes."]