My point is this: Cutting our planes' emissions will do nothing but place further financial strains on us, leading to a relative inability to compete with other countries less concerned about the illusory monster of global warming.
Since you're keen on models, do you have a model showing it will be a long term economic disadvantage to cut emissions? The fact is, most changes geared toward reducing global warming involve either 1) increased efficiency or 2) use of alternative, less-polluting energy. Given that fossil fuels are a limited resource, this is something we'll have to do eventually anyway, and we may as well be ahead of the curve.