Columbia subject headings:
Aeronautics, Commercial--United States--Finance.
Air traffic control--United States--Finance.
Airport and Airway Trust Fund (U.S.)--Forecasting.
United States. Federal Aviation Administration--Appropriations and expenditures.
Harvard subject headings:
Aeronautics, Commercial--United States--Finance.
Air traffic control--United States--Finance.
Airport and Airway Trust Fund (U.S.)--Forecasting.
United States. Federal Aviation Administration--Appropriations and expenditures.
Princeton subject headings:
Aeronautics, Commercial--United States--Finance.
Air traffic control--United States--Finance.
Airport and Airway Trust Fund (U.S.)--Forecasting.
United States. Federal Aviation Administration--Appropriations and expenditures.