Air Accessibility Map Mapping the accessibility for 400+ U.S. airports


This project provides an overview of current US domestic air passenger traffic. It shows the results in detailed maps of the air service accessibility of individual airports (places). The wide range and geographical scope (400+ airports) of the data assure coverage of both large national hubs, as well as many smaller airports in every region. The idea is to use non-stop service as an ACCESSIBILITY INDEX to develop contrasts between levels of service (e.g. non-stop vs. one- and two-stop service). Such an index provides a simple summary measure of the geographical contrasts between places in the current domestic air passenger transport system.

The project will illustrate changes in these results over time and so will produce measures of the changes in air accessibility. It is expected that many interesting features of the system will emerge. By providing a comprehensive panorama for all parts of the US, an unusually rich data portrait is given. Each region has individual maps for the airports in that State or Territory. Each map contains information about that particular origin airport's results.


Here is the list of maps of the data. The atlas is organized by states/regions. You can select any of them to investigate the detailed information of each quarter.


A key ingredient in these maps is the actual travel patterns observed from the DB1B(Airline Origin and Destination Survey),which is a 10% sample of air tickets for each quarter. Its data includes origin, destination and other itinerary details of passengers transported. The most important information is how many stops are involved on each itinerary. We recover the accessibility indicator from this 0/1/2 stops information.


How do the passengers reach their destinations? Here are three major patterns:

Image 1: An illustration of non-stop/one-stop/two-stop flight.

Image 2: One-stop flights from CVG to SEA.

Another example is presented in image2, showing how passengers travel from Cincinnati(CVG) to Seattle(SEA) via one-stop flights. We can observe lots of detours.

In practice, we only focus on zero, one and two stop trips, because they cover about 99% itineraries in the database.


The method is to examine the distribution of passengers from an ORIGIN to all the DESTINATIONS that they wish to reach. We compute the percentage of passengers who reach their destination directly (i.e. non-stop), those that reach via one stop, and so on. For each origin, the maps show the share going to a particular destination directly using the blue shaded portion of the pie chart. (More blue is better service.) The one stop share is green, and the two stop share is red. We do not include the higher stop itineraries as they are comparatively rare as a share of total passengers. [Such higher indirect flights can of course account for extraordinarily long travel times.]

As we develop this site, we will also show aggregate statistics for each origin such as CIRCUITY and share of total passenger miles that are direct.


E.J. Taaffe, H.L. Gauthier, and M.E. O'Kelly, 1996. Geography of Transportation, 2nd edition.

Available on Google Books at: here.


This website is set up by Kejing Peng and maintained by Muzi Feng under the supervision by Professor Morton O'Kelly.

Any suggestion is welcome. You can provide your opinion or suggestion to our team by email:


Thanks to our funding support:

Thanks to the Department of Geography and the Center for Urban and Regional Analysis.

Special thanks to Jens Blegvad and Shaun Fontanella for hardware/server support.


Copyright © 2014, Air Access Team at Department of Geography, The Ohio State University.