some combination of using aviation biofuel (which in principle can be produced in a nearly carbon-neutral way) and buying non-fake carbon offsets (i.e., actuall

some combination of using aviation biofuel (which in principle can be produced in a nearly carbon-neutral way) and buying non-fake carbon offsets (i.e., actually taking physical carbon out of the air) would probably be good enough. this would further absurdly increase the cost of operating a private jet, but billionaires could still afford it.