Hi,
Thanks to the link given by Clint for
Photo Album USAAS we have in this album the Breguet 14 n°5546 "5" of Escadrille BR35 at Tergnier :
https://www.ebay.com/itm/38449493712...gAAOSw1e1hjWP3
The incredible story of this flight is page 88 and following in the book "
Les Géants de Morville" by Nicolas Clinaz
The passenger is H. Geyer german parliamentarian to assist in the signing of the Armistice.
Bertrand