Justme,
The emissions in the upper atomsphere create NOx. This from NASA
Quote:
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Oxides of nitrogen (chemically abbreviated as NOx and pronounced "nocks") increase the production of ozone at typical cruise altitudes of subsonic air travel. These emissions are formed as a result of burning fossil fuels at very high temperatures. Therefore, aircraft emissions containing NOx increase the production of ozone. Aircraft emit significant amounts of NOx when their engines are at their hottest during takeoff and slightly smaller amounts while cruising
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http://www.nasa.gov/centers/glenn/about/fs10grc.html
I think we are in danger of agreeing Justme... which is probably a first.