board were killed (16 passengers and 4 crew). 17 October 1939S.73 I-IESI? of Ala Littoria crashed en route to Melilla Airport (MLN/GEML) with the loss of 15 of the 17 persons on board (10 passengers and 5 crew). 16 March 1940S.73 I-SUTO of Avio Linee Italiane (ALI) crashed on Stromboli in bad weather killing all 14 aboard (9 passengers and 5 crew). 14 May 1940S.73P OO-AGP of Sabena was destroyed on the ground at Brussels-Haren Airport to prevent capture by invading German forces. 23 May 1940S.73P OO-AGS of Sabena was shot down by German ground fire near Arques, whilst being operated on behalf of No.271 Squadron RAF, with the loss of one crew member. 23 May 1940S.73P OO-AGZ of Sabena was destroyed on the ground at Merville whilst being transferred to No.24 Squadron RAF. Operators Civil operators SABENA ČSA Ala Littoria Avio Linee Italiane Military operators Belgian Air Force Regia Aeronautica Italian Co-Belligerent Air Force Royal Air Force No. 24 Squadron RAF No. 117 Squadron RAF Specifications (S.73) See also References Notes Bibliography Lembo, Daniele, SIAI 81 Pipistrello, Aerei nella Storia, n.33. S.73 1930s Italian airliners World War II Italian transport aircraft Trimotors Low-wing aircraft Aircraft first flown in 1934