The Italian Caproni Ca. 4 of 1917 was another successful design and entered service with the Italian air force as a heavy bomber in 1918 . Many further variants were produced , both during and after the war . Caproni later re-numbered many of these variants as new types , including the Ca. 48 airliner . In Italy 's first commercial aviation disaster and one of the earliest &ndash; and , at the time , deadliest &ndash; airliner accidents , a Ca. 48 crashed while flying over Verona , Italy , on August 2 , 1919 , killing everyone on board ( between 14 and 17 people ) . The unsuccessful Caproni Ca. 60 prototype transatlantic seaplane had three sets of triplane wings taken from the Ca. 4 , making nine wings in all , and is generally classified as a multiplane
crashed
1919 Verona Caproni Ca.48 crash
Triplane