Fig 1.
Evolution of air traffic and COVID-19 confirmed cases in Europe and China.
Fig 2.
Resilience assessment framework for airport network.
Table 1.
Network metrics.
Fig 3.
Efficiency comparison between Chinese and European airport networks based on different attack strategies.
Fig 4.
Comparison of network efficiency based on different recovery strategies.
(a)–(d) show the recovery process of the CAN and EAN based on degree and node strength recovery strategies; the red box and blue box in (e) and (f) represent variation in air traffic of airports in China and Europe in 2019 and 2020, respectively.
Fig 5.
Comparison between CAN and EAN on October 1st to 31st before and during the COVID-19 pandemic.
Fig 6.
Resilience index of airports during COVID-19 pandemic.
Orange and green bar represent the resilience metrics of the first seven months of 2020 and entire year of 2020, respectively.
Table 2.
Comparison of resilience metrics in China and Europe during COVID-19 epidemic.