The service commenced as a thrice weekly flight between Singapore and Penang. The first flight, using an 8-seater de Havilland DH.89A Dragon Rapide took place on 28 June 1937 This inaugural flight departed Singapore from the then brand-new Kallang Airport, which had just opened earlier in the same month on 12 June. Later, a second DH.89A enabled the expansion to daily services as well as the addition of Ipoh as a destination. During World War II, WAS services ceased after the Japanese occupation of Malaya and Singapore in 1941. An initiative by the Alfred Holt's Liverpool-based Ocean Steamship Company, in partnership with the Straits Steamship Company and Imperial Airways, resulted in the incorporation of "Malayan Airways Limited" (MAL) in Singapore on 12 October 1937, but the first paying passengers could be welcomed on board only in 1947, some 10 years later. After the war, MAL was restructured to include just the partnership of Straits Steamship and Ocean Steamship. The airline's first flight was a charter flight from the British Straits Settlement of Singapore to Kuala Lumpur, on 2 April 1947, using an Airspeed Consul twin-engined aircraft. This inaugural flight on the "Raja Udang", with only five passengers, departed Singapore's Kallang Airport and was bound for Kuala Lumpur's Sungai Besi Airport. Weekly scheduled flights quickly followed from Singapore to Kuala Lumpur, Ipoh and Penang from 1 May 1947 with the same aircraft type. The airline continued to expand during the rest of the 1940s and 1950s, as other British Commonwealth airlines, such as BOAC and Qantas Empire Airways, provided technical assistance, as well as assistance in joining the IATA. By 1955, Malayan Airways' fleet had grown to include a large number of Douglas DC-3s, and finally went public in 1957. Other aircraft operated in the first two decades included the Douglas DC-4 Skymaster, the Vickers Viscount, the Lockheed L-1049 Super Constellation, the Bristol Britannia, the de Havilland Comet 4 and the Fokker F27. Over the next few years, the airline expanded rapidly, boosted by post-war air travel demand when flying became more than a privilege for the rich and famous. By April 1960, the airline was operating Douglas DC-3s, Super Constellations and Viscounts on new routes from Singapore to Hong Kong, and from Kuala Lumpur to Bangkok via Penang.