Re: Ban flights altogether.
"Until the sun heats up enough to make complex organic molecules infeasible on the Earth's surface, there will very likely be some life here."
Don't be so sure. The conditions in the Earth when biological life as we know it first began were considerably different from conditions today. The conditions to start life and the conditions to maintain that life need not be the same: sort of like how you need that initial crank to start an internal combustion engine but after that it can putter along on its own power.
So IOW, if by some catastrophe all life stopped existing on Earth, even for a short time, it's like the engine stalling. Now you have to bet on the long-term state of the Earth to still be able to start that life again, and that's not guaranteed.