Froggy -
Boy, that does seem like a very good candidate.
I suspect that these cards were not instantly printed and available on the spot, but I am not really sure I understand the photographic process utilized at that time. That is something I will have to spend some time investigating.
If only the author had written a bit more about the location of the planes in relationship to where he was in the Argonne. Looking at the fiche, it does seem to correspond with the area where these two were last seen, I think.
Thank you all for the assist. If it is these two, then this was their aircraft and I suspect they died not far from this location.