Use RITA and TranStats, both from the Bureau of Transportation Statistics, to find a tremendous amount of data, including:

• Revenue Passenger-Miles
• Airline Fuel Cost and Consumption
• Airline Employment Data
• Border Crossing Data
• Automobile Driving Cost vs Public Transit Cost

Go to Sage Data.

• Select Browse by Subject to expand, then select Transportation and Travel to find a variety of data series.

Go to the ITF Transport Statistics database available in OECD iLibrary. Contains statistics collected by the International Transport Forum on the transport of freight (maritime, air, and surface) and passengers (car, rail, and air), plus data on road safety (accidents, injuries, and deaths), and transport infrastructure maintenance and investment. In several sectors, data are available from 1970 on and cover the 59 ITF member countries. 

Plot a map of ports and vessels (tankers, cargo) using Bloomberg (see access details).

• Type BMAP and hit the green <GO> key.

Check out the library's Transportation Industry research guide for other relevant resources.