Columbia subject headings:
Aeronautics--United States--Safety measures--Finance.
Aircraft accidents--United States--Prevention--Finance.
Airlines--Employees--Salaries, etc.--United States.
Airlines--United States--Finance.
Harvard subject headings:
Aeronautics--United States--Safety measures--Finance.
Aircraft accidents--United States--Prevention--Finance.
Airlines--Employees--Salaries, etc.--United States.
Airlines--United States--Finance.
Princeton subject headings:
Aeronautics--United States--Safety measures--Finance.
Aircraft accidents--United States--Prevention--Finance.
Airlines--Employees--Salaries, etc.--United States.
Airlines--United States--Finance.