Loss of Oxygen in outer atmosphere due to Air Craft flying with Air breathing engines?

No need for such. The ozone layer is far above the altitude at which aircraft fly -- even the late SST, so aircraft can have no effect on ozone. Nor is there any reason for concern about oxygen consumption -- the air has a lot of it. As for hydrogen, the amount of free hydrogen in the atmosphere is slight; it combines with oxygen, or escapes to outer space.

FYI: All conventional aircraft engines require air to operate because air (oxygen) is a requirement for combustion. Some craft (like rockets and the space shuttle) bring their own supply of oxygen since there is no air in outerspace and very little air in the outer atmosphere (a fact of nature which has nothing to do with anything man-made). And there has never been a problem with the "reduction" of oxygen or hydrogen in the atmosphere. There's plenty for everyone, that I can assure you.

UPDATE: I'm not aware of any study to measure the amount of disturbance caused by breathing apparatus (are you doing research on ramjets?), but you can do a simple thought experiment to verify if a problem does indeed exist: the use of high-altitude (above the stratosphere) aircraft is very very minimal (almost negligible) compared to other things that cause a significant impact on the atmosphere...such as public and private land and air transportation, use of fossil-fuels for energy generation, heating and manufacturing. but the main problem linked to man's use of fossil-fuels for the above-mentioned puposes is not the reduction of oxygen in the atmosphere. Rather it is the degredation of the QUALITY of air in the lower atmosphere, or what we simply call POLLUTION. Air pollution is largely limited to the troposphere. And knowing that, the effect of using high-altitude aircraft now becomes insignificant in terms of leaving an ugly footprint in the upper atmosphere. I'm sure you are aware also that free energy does not exist (even solar energy comes at a cost) and ozone depletion is caused by the use CFC's.

On the use of new technology that gets fuel from the air instead of conventional fuels: I think it's a brilliant idea. Not only does it make upper-atmosphere and space travel (taking the technology further to get fuel from hydrogen atoms in space) much more economical, it also helps with our current problem of dependency on conventional fuels. We have enough problems already with our dwindling supply of fossil-fuels/crude oil. Technology that reduces our dependency on the fossil-fuels is a very big step forward, if you ask me. If you are part of a team that contributes to its development, good luck and more power to you.

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