Columbia subject headings:
Airlines--Deregulation--United States.
Airlines--Employees--Salaries, etc.--United States.
Airlines--United States--Employees.
Harvard subject headings:
Aeronautics, Commercial--Government policy--Canada.
Aeronautics, Commercial--Government policy--United States
Aeronautics, Commercial--Labor productivity--Canada.
Aeronautics, Commercial--Labor productivity--United States.
Airlines--Canada--Employees.
Airlines--United States--Employees.
Princeton subject headings:
Airlines--Deregulation--United States.
Airlines--Employees--Salaries, etc.--United States.
Airlines--United States--Employees.