The overwhelming reduction in burning hydrocarbon fuels for perhaps three to six months predicates
a wonderful reduction in carbon dioxide release as well as pollution.
With cleaner air, and a revised less frenetic rushed lifestyle aided by a step change in social behaviour could well be key in helping us live longer and in a nicer more comfortable environment.
Consequently the above exchanges are about as useful as calculating how many fairies can sit on the head of a pin !
The world as was will, with luck, not be restored in its old image.
Flying for fun is great but non essential habit. Most commercial flight is likewise, whilst business has already found alternative "face to face" methods of communication.
Covid upheaval will be seen by history to have been a curious boon to mankind. (IMHO).