The World Health Organization's International Health Regulations (2005) required countries to seek approval from WHO before halting international flights, otherwise deeming such activity a violation of international law. However, this rule is very likely to be changed at the 74th World Health Assembly (24 May-1 June 2021), despite support from previous research. What kinds of travel restrictions were imposed in different parts of the world during the pandemic—and how and what were the consequences? — Jelena Dzankic, Timothy Jacob-Owens, Lorenzo Piccoli, Biao Xiang