Flights are not full at the moment - especially since only Argentines can really use them. Will likely be this way until at least after our winter.
In terms of risk - It is of course still
possible to get COVID on a long flight even with pre-departure testing since travelers could still be at the incubation or early infection stages when tested with the infection developing further on the flight. Despite that it is still a lot safer than sitting on a bus or train for a decent amount of time given the air filtration systems. It’s probably far safer than being in a restaurant near to an infected person for less time too. Attached an article that talks about a scientific study done on some cases linked back to a long haul flight and how they suspect it happens.
A new study shows how Covid-19 spread on an 18-hour flight from Dubai to Auckland, eventually infecting four people on-board and another in MIQ.
www.newsroom.co.nz