Send to

Choose Destination
Proc Natl Acad Sci U S A. 2005 May 31;102(22):7794-9. Epub 2005 May 23.

The worldwide air transportation network: Anomalous centrality, community structure, and cities' global roles.

Author information

Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA.


We analyze the global structure of the worldwide air transportation network, a critical infrastructure with an enormous impact on local, national, and international economies. We find that the worldwide air transportation network is a scale-free small-world network. In contrast to the prediction of scale-free network models, however, we find that the most connected cities are not necessarily the most central, resulting in anomalous values of the centrality. We demonstrate that these anomalies arise because of the multicommunity structure of the network. We identify the communities in the air transportation network and show that the community structure cannot be explained solely based on geographical constraints and that geopolitical considerations have to be taken into account. We identify each city's global role based on its pattern of intercommunity and intracommunity connections, which enables us to obtain scale-specific representations of the network.

Supplemental Content

Full text links

Icon for HighWire Icon for PubMed Central
Loading ...
Support Center