Columbia subject headings:
Harvard subject headings:
Air traffic control--United States--Finance.
Airport Improvement Program (U.S.)--Appropriations and expenditures.
Airports--United States--Finance
United States. Federal Aviation Administration--Appropriations and expenditures.
Princeton subject headings:
Air traffic control--United States--Finance.
Airport Improvement Program (U.S.)--Appropriations and expenditures.
Airports--United States--Finance.
United States. Federal Aviation Administration--Appropriations and expenditures.