The firm of Appareils d'Aviation Les Frères Voisin, the world's first commercial airplane factory (1908) which was initially located in Boulogne-Billancourt,[citation needed] transformed itself into a luxury automobile manufacturing company named Avions Voisin in 1920. Most of Voisin's manufacturing facilities were then relocated in neighboring Issy-les-Moulineaux. Avions Voisin closed its doors in 1940.