Keystone Pathfinder (US, 1927) Keystone Patrician (US, 1929) Kreutzer Air Coach (US, 1928)[40] L-W-F Type H Owl (US, 1920)[41] Lasco Lascondor (Australia, 1930) Latécoère 4 (France, 1920) Latécoère 5 (France, 1924) Latécoère 24 (France, 1927) Latécoère 340 (France, 1930) Latécoère 350 (France, 1931) Latécoère 500 & 501 (France, 1932) Latécoère 582 (France, 1935) Latham Trimotor (France, 1919)[42] Lawson L-4 (US, 1924)[43] Letov Š-32 (Czechoslovakia, 1931) Lioré et Olivier LeO H-15 (France, 1926)[44] Loire 30 (France, 1932) Loire 60 (France, 1932) Loire 70 (France, 1933) Loring-Barrón Colonial T-III Trimotor (Spain, 1932)[45] Macchi M.C.100 (Italy, 1939) Nieuport-Delage NiD.590 (France, 1932)[46] Nieuport-Delage NiD.740 (France, 1930)[47]