Anyway, there is a current discussion on the HOTT Yahoo Group about suitable models to depict fliers in Martian armies, so I thought I would post scans of illustrations I have of them that I think are close to how they are described in the books.
The first three are from 'Warriors Of Mars - The Warfare Of Barsoom In Miniature' by Gary Gygax and Brian Blume and published by TSR in 1974*. The pictures are by Greg Bell. Click on them to see them bigger:
This small picture is the only depiction of a flier I could find by Michael Whelan. He did cover illustrations for all eleven of the Martian novels, and all of them are pretty accurate with regard to the descriptions and contents of each book. So if Michael Whelan thinks that this is what a Barsoomian flier looks like, then this is probably what a Barsoomian flier looks like. It's tucked away on the back cover of 'Llana of Gathol':