One vital question in all this is where will the insurers sit if an airline starts operating again? "Err OK KLM - all risks except volcanic ash covered"
I once was told an interesting story by an aviation insurance broker abou KLM who one year said to their insurers "we've had xxx years accident free with you, we'd like to talk about a lower premium". Insurers apparently said, "It will be twice this year's, we work on statistics and you are overdue for a big one".
The following year? You've guessed it.