Airfields on the edge of No Man's Land is probably unrealistic unless it is a former airfield which was over-run during an offensive. We lost several during the great German offensive of 1918.
As for artillery range, as a commander you would want to keep your airfields out of field-artillery range at least. No Allied airfield was ever truly out of artillery range after the Germans deployed the Paris Gun.
http://en.wikipedia.org/wiki/Paris_Gun
This had a range of about 75 miles but was only ever aimed at Paris itself.
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