The global economy has been severely disrupted by COVID-19, with the virus wreaking particular devastation on the travel industry. While international travel will eventually return, either as governments start to bring infection rates under control or with the development of a vaccine, it’s a waiting game that many airlines, tour operators and hotels aren’t willing to play. In recent months, the idea of introducing digital immunity passports has begun to circulate as a potential lifeline to jumpstart international leisure travel.