A tax would be better then a cap and trade system for international aviation. A tax provides much better benefits for both parties. Taxing instead of using a cap and trade system will bring in a much more steady income. Both systems have their flaws but in the end taxation wins out.
No, when it comes to international aviation, a tax would not be a better alternative than a cap-and-trade system, because there are positive aspects to the cap-and-trade system. Aviation can only handle a certain amount of capacity. Airports and airspace have limitations. Because the system will be overloaded at a certain point, a cap-and-trade system is more appropriate than a tax.