Okay, at the end of every good study there must be some conclusions drawn and I have spent so much time reading about this subject over the last few days I am braindead.
Probably the best I can come up with thus far is that this subject is far more extensive than can be discussed in a 1000 word article in a magazine, accompanied by this picture that initially caught my attention.
One ounce of information has led me onto another and another and so on... it is literally neverending. The technical/scientific assessment and results of which must have inspired this article were derived from the studies of the IPCC.
This is by no means a simplified answer or conclusion to this thread...
http://www.grida.no/climate/ipcc/aviation/index.htm - Chapter 2.4 does offer "Conclusions and Overall Assessment of Present Aviation Impacts on Ozone".
Bottom line of what it says (or the top line actually!) is
Currently, there is no experimental evidence for a large geographical effect of aircraft emissions on ozone anywhere in the troposphere.
It is a snippet from a LOT of information.