Open Flights: Airport, airline and route data across the globe. Data is provided as CSV files. It includes all known airports, and a large number of routes between airports.
World Port Index: Dataset from the National Geospatial Intelligence Agency listing approximately 3700 ports across the world, with location and facilities offered.
Global Roads Open Access Data Set: A vector dataset of roads across the world, suitable for mapping at the 1:250,000 level and the dataset is accurate to approximately 50m.
JRC Travel Time to Major Cities: Travel time to the nearest major city (> 50,000 people) across the whole world, at approximately 1km resolution.