Exploring the Regional Structure of the Worldwide Air Traffic and Route Networks

Figure 6

Average degree-degree correlation versus degree of the large components. The blue dots represent the average degree-degree correlation for the unweighted network. The red dots represent the average degree-degree correlation for the weighted network. The weighted degree-degree correlation is more significant than the unweighted degree-degree correlation. A high fraction of traffic is concentrated between major hubs in the local components. This concentration of traffic at these hubs is essential for optimizing the overall efficiency and connectivity of the air transportation network.