Paul Fressanges du Bost on Wikipedia
For those interested, I just published a page on my grandfather on the french Wikipedia. If there is enough requests I'll consider doing it also in english.
Like many, he started the war in artillery (by the way some interesting books have been published in 2009-2011 on this subject)
Escadrilles C34 / C28 / SPA124 / SAL 264 and after the war SAL 19, BR246, SAL 33