Columbia subject headings:
Air travel--United States.
Parfit, Michael--Travel--United States.
United States--Description and travel.
Harvard subject headings:
Air travel--United States
Parfit, Michael--Journeys--United States.
Parfit, Michael--Travel--United States.
United States--Description and travel.
Princeton subject headings:
Air travel--United States.
Parfit, Michael--Travel--United States.
United States--Description and travel.