The Latecoere 302 is a military variant of the 300 series designed mid 30s for transatlantic mail flights which entered service for Air France from Dakar, Senegal to Natal, Brazil. The civilian 301, and military 302 were based on the 300, with some design improvements. A total of three aircraft of each type were built in 1935 and 1936. After the loss of the first 301, the remaining two were operated in South Atlantic service until 1939. In 1939 the last remaining 301 was converted to military service, joining the 302s in patrol duties in West Africa.
Original Latecoere 302 aircraft had 930-hp Hispano-Suiza 12Ydrs engines, bow, beam, and engine nacelle machine gun ports, and a bomb load of 661 lbs. The aircraft had a crew of four and included rest areas. Fuel and payload were stored inside the hull. The 302s and converted 301 were still in service at the start of World War II, flying patrols from Dakar until retired due to lack of spare parts, the last aircraft being grounded at the end of 1941.