first and foremost - it must be de-industrialized in a sense, that aviation is not "just a business". CEO's who get payed extra if companie's share value rises, so taking care for themselves by buyback of own stock with someone else's money, should stop, should be strictly prohibited. De-regulation has started race to the bottom and increased pollution, as flying became so mondane, as walk in the park. I hope that there will be significant increase in investment in real public transport, like high-speed rails - as routes up to 500 km (or even more) on continent should be covered by high-tech trains, rather than aeroplanes. And everything is not for sale or to be used freely, withouth any moderation. Like airspace - drones and autonoumus airplanes and crap like that. Or we will wanish as species rather sooner than later.