The Caudron C.230 biplane F-AJZJ was operated by the aero club at Roubaix - Flers and, although this photo is from a library in Le Havre, we believe this is Flers, based on photos on the Anciens Aérodromes website. The first owner of F-ALKL was also from the Nord department. Both these aircraft were new in July 1931. Another hangar was added at Flers by 1933. Photo from: Bibliothèque nationale de France - Gallica