Columbia subject headings:
Aeronautics, Commercial--Research--United States--Finance.
Aeronautics--United States--Safety measures--Finance.
Airports--United States--Finance.
United States. Federal Aviation Administration--Appropriations and expenditures.
Harvard subject headings:
Aeronautics, Commercial--Research--United States--Finance.
Aeronautics, Commercial--United States--Safety measures--Finance.
Airports--United States--Finance
United States. Federal Aviation Administration--Appropriations and expenditures.
Princeton subject headings:
Aeronautics, Commercial--Research--United States--Finance.
Aeronautics--United States--Safety measures--Finance.
Airports--United States--Finance.
United States. Federal Aviation Administration--Appropriations and expenditures.