Not wishing to be pedantic, the ban will be on the sale of new petrol cars.... but I take your point. Some environmentalists will want to make a meal out of COVID and exploit the "advantages" there have been with less flying.
Apart from Trump I think most of the world has concerns about global warming. From 2023 no gas boilers can be installed in new UK homes, no pure petrol or diesel cars can be sold in 10 years time. I can't see aviation being untouched and allowed to get out of control so I expect taxes to be introduced on aviation fuel for the first time to deter some people from flying so often. Also there is that Covid debt to pay off. I also think a Labour government would be tougher on aviation than this government.
As for Covid, that will be simmering away in the background for years