Captions:
Table 1: The list of countries and corresponding airports included in the present study to simulate the flight connections and screen the passengers. The airports abbreviations are the IATA (International Air Transport Association) codes. WUH: Wuhan, PEK: Beijing Capital International Airport, CAN: Guangzhou Baiyun International Airport, CDG: Paris-Charles De Gaulle, ORY: Orly Airport, FRA: Frankfurt Airport, MUC: Munich International Airport, FCO: Leonardo da Vinci International Airport, MXP: Malpensa Airport Milan, DXB: Dubai International Airport, SHJ: Sharjah International Airport, AUH: Abu Dhabi International Airport, DOH: Hamad International Airport Doha, KWI: Kuwait International Airport, MCT: Muscat International Airport, IKA: Imam Khomeini International Airport Tehran, MAD: Madrid-Barajas Adolfo Suárez Airport, SIN: Singapore Changi Airport, BKK: Suvarnabhumi Airport Bangkok, HKT: Phuket International Airport, LHR: Heathrow Airport London, JFK: John F. Kennedy International Airport New York, ORD: O’Hare International Airport, Chicago, and SFO: San Francisco International Airport.
Figure 1: Global map indicating the location of 24 different airports from 10 different countries considered in this study. The size of the circles represents the importation risk index. The political boundaries are for the representation only as provided by the original data source and authors not necessarily agree with the same.
Figure 2: Chart representing the importation risk index for various countries derived between 4th March 2020 and 24th March 2020 by taking an account of 24 international airports in respective countries.
Figure 3: The scatter plot between the actual number of cases in India imported from ten countries (corresponding airports are listed in Tab. 1) and derived importation risk index. The inset figure is similar to the main figure except data point pertaining to middle east is excluded.
Acknowledgement: Authors gratefully acknowledge the support and thoughtful insights from selected faculty members from Dept. of Civil Engineering at IIT Madras. SSG is thankful to Nabha S. Gunthe and Nupura S. Gunthe for constant encouragement and stimulating discussions.
Author contribution: SSG conceived the idea. SSP carried out the simulations along with collecting and analyzing the data. SSP and SSG performed the interpretation of the data. SSG wrote the manuscript with input from SSP.
Competing interest: Authors declare no competing interest.
Conflict of interest: Authors have no conflict of interest regarding this work.
Funding: No funding was available/used for this study.
Data availability: The data that support the findings of this study are available from the corresponding author upon reasonable request.
Ethical statement: Ethical statement is not applicable for this study.