This database breaks down long-distance travel (defined by a distance greater than 100-miles) by purpose, by transportation type and by distance category, for the average person in the US, and in aggregate.
It is based on over 1.2GB of raw data, collected by the US FHWA and US DOT in 2007-11, which is still widely cited around the Academic literature and thus relevant to assessing the post-COVID landscape.
The data show the full breakdown of long-distance travel by plane, car, bus and train; for business, leisure activities and commuting; from 100-miles to 4,000-miles; how these different factors co-vary; and how they have changed between 2010 and 2017.
The chart below illustrates the headline data, aggregating all modes of transport by purpose and travel distance. Alternate versions of the chart are available for just planes, automobiles, buses and trains.