FILE PHOTO: People queue to enter terminal 2, as tighter rules for international travellers start, at Heathrow Airport, amid the spread of the coronavirus disease (COVID-19) pandemic, London, Britain, January 18, 2021. REUTERS/Henry Nicholls
(Reuters) - While politicians hail digital health passes as the solution to aviation's COVID-19 crisis, airline bosses are still having sleepless nights about clogged up airports as they worry how to deal with the millions who have already been vaccinated.
More than 220 million people have been fully vaccinated against the disease, according to Our World in Data. Almost a billion have had at least one dose. (https://bit.ly/32HJtHQ)
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