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

A good-looking biplane, the C.230 first flew in 1930. Some 75 examples were apparently built, mostly Renault-powered C.232s. The C.270 Luciole was developed from it. F-AJZJ was registered to the Club d'Avions Légers de Flandres in Lille in June 1931. The club had an airfield in Roubaix - Flers and it looks like the photo was taken there - see photo 567334 for the full picture. Photo from: Bibliothèque nationale de France - Gallica