Columbia subject headings:
Airport terminals--History--20th century--Congresses.
Harvard subject headings:
Airport buildings--Europe--History--20th century--Congresses.
Airport terminals--Europe--History--20th century--Congresses.
Airports--Europe--History--20th century--Congresses.
Princeton subject headings:
Airport buildings--Conservation and restoration--Europe--Congresses.
Airport buildings--Europe--History--Congresses.
Airports--Europe--History--Congresses.