July 2021 is based on how long it is expected to have a COVID vaccine tested and disseminated to the population and the borders can be reopened.
There maybe a requirement that all international inbound visitors be vaccinated (x) number of weeks before their inbound flight.
No vaccine no flight.
If a vaccine is found, tested and disseminated earlier then I expect the borders to be opened earlier.
Likewise, if no vaccine is found then all bets are off
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