Global Warming Question?

Why is it that automobiles get all the blame with global warming when our skies are filled everyday with fuel burning jets and planes. Also, the plane exhaust is much closer to the ozone layer and surely must effect it much more than auto-exhaust. Plane fuel is also much purer in octane than car fuel. If you ask me I'd say it's a sore-subject to speak about because the wealthy are up in the air all the time. hmm.. can't get a plane to fly from a battery, bet that's why they don't touch it.