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. 2021 Sep 17;94:101127. doi: 10.1016/j.retrec.2021.101127

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© 2021 The Author

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 4 — Evolution of network connectivity in 2020/21 and dependency structures.

Note: All panels covering only airports present in both 2020/21 and 2019 snapshots. Panel a) depicts the evolution of median airport susceptibility from January 2020 to June 2021 relative to 2019 and the inset shows the functional relationship with network flux. Panel b) depicts the cumulative probability distributions of airport susceptibility for July 17th, 2020 and Panels c)-d) map the evolution of airport susceptibility in a spatial context (Panel c) and for intra-community flows only (Panel d). Panels e)-f) depict airport susceptibility as a function of inverse airport strength and average shortest path length based on the network snapshot corresponding to July 17th, 2020.