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