The World Tourism Organization (WTO) is the leading international organisation in the field of travel and tourism. Many of their statistical publications are available from this website, including a basic facts and figures page.
The library also holds some of their statistical publications in print format:
OECD statistical publications on transport topics are available through the library's subscription to OECD iLibrary (formerlySourceOECD).
Select BOOKS, then Theme: Transport for the following: