Salut Gilles,
And you know as I know that it's a difficulty even for us French!
Note: 2./JG101 was based in Pau-Ost (?) during that period; Lourdes did concern 3./JG101 following that page
http://www.ww2.dk/air/jagd/jg101.html. But what was Pau-Ost? Tarbes? Ossun? A simple Airstrip....?
Regards, Franck.