 The CANT Z.501 (1934) and Z.506 (1935) seaplanes, and the Z.1007 landplane bomber (1937) became the standard Italian types in their categories.Zappata saw wooden airplanes as a temporary necessity, and his new designs were conceived with all-metal construction, including the Z.1018 bomber twin, Z.511 four-engine floatplane airliner, and Z.515 twin floatplane.Around 1939 Zappata became disillusioned with CANT and started negotiating with Breda, which he joined in 1942; in addition, military requirements fluctuated.