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Depends on the scale - we are talking mass vaccination of the whole planet here.

Not really, if every airport runs a vaccination program that takes 2 months before someone can fly there's very little need for more global infrastructure. The problem with lockdowns, etc is reinfection mostly by air travellers.

How could that possibly be the problem?

This maybe _was_ the problem in the beginning of the pandemic. Now, it's in the general population and will spread even if you ban all airplanes and repurpose airports into petting zoos.

We already know how to drop the R value in a given place. It is pointlessly expensive to do so for long enough to eliminate the virus in any place that is going to be reconnected to the air network until travellers have a very low chance of infection.

Sure some places will find total vaccination the best option, but places with out the infrastructure and money can simply do one lockdown that isn't compromised again by air travel.

China is an example that would have left the pandemic if not for the need to resume Air travel.

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