Columbia subject headings:
Airlines--Customer services--United States.
Airlines--United States--Management.
Airports--Baggage handling--Economic aspects--United States.
Airports--Baggage handling--United States.
Harvard subject headings:
Airlines--Customer services--United States.
Airlines--United States--Management
Airports--Baggage handling--Economic aspects--United States.
Airports--Baggage handling--United States.
Princeton subject headings:
Airlines--Customer services--United States.
Airlines--United States--Management.
Airports--Baggage handling--Economic aspects--United States.
Airports--Baggage handling--United States.