Question: What was the nickname of the Australian pioneer aviator who owned the Lady Southern Cross monoplane and made a flight from Austraia to London in a record 10.5 days??

Context paragraphs:
Southern Cross (aircraft): Southern Cross is the name of the Fokker F.VIIb/3m trimotor monoplane that in 1928 was flown by Australian aviator Sir Charles Kingsford Smith, Charles Ulm, Harry Lyon and James Warner in the first-ever trans-Pacific flight to Australia from the mainland United States, a distance of about 7250 mi .

Southern Cross Route: Southern Cross Route is a term for passenger flights from Australasia to Europe via the Western Hemisphere.  The Kangaroo route is its counterpart running through the Eastern Hemisphere, with many more flights.  Both terms were invented by airlines when they started flying the two routes (Qantas on the Kangaroo Route, British Commonwealth Pacific Airlines on the Southern Cross), so they have no "official" definitions; probably no airline has ever described a route from Europe to Australasia via South America as "the Southern Cross Route".  (And BCPA/Qantas called it the "Southern Cross Route" when it only extended from Australia to Vancouver, before 1958.)

John Robertson Duigan: John Robertson Duigan MC (31 May 1882 – 11 June 1951) was an Australian pioneer aviator who built and flew the first Australian-made aircraft.  Duigan was born in Terang, Victoria, and grew up in Melbourne attending Brighton Grammar School.  He travelled to the United Kingdom in late 1901 to study electrical engineering at Finsbury Technical College in London (1902-1904) and Motor Engineering at Battersea Polytechnic (1905).  He worked for the Wakefield & District Light Railway Co. until 1907 when he returned to Australia.  From 1908 he lived at 'Spring Plains', a sheep station owned by his father near Mia Mia in central Victoria.  After seeing a postcard of Wilbur Wright's flights in France in late 1908 he began experimenting with aviation, first constructing a Wright-type glider, and then a powered aircraft.  The 20-25 horsepower, four-cylinder engine was made in Melbourne by J.E. Tilley.  This Farman-type biplane made a short flight on 16 July 1910, but Duigan never considered this to be a fully controlled flight.  He regarded his longer flight of 7 October 1910 as his first successful attempt.  This was followed by ever longer and higher flights.  His younger brother, Reg Duigan assisted with most aspects of the construction and testing of the biplane and later flew it about a dozen times.  The biplane was flown in public at Bendigo Racecourse on 3 May 1911 where it completed its only circling flight as the paddock at Spring Plains was surrounded by hills and trees.

Sea FM: Sea FM is a commercial Australian radio network, consisting of stations in Queensland and New South Wales and is owned by Southern Cross Austereo.  Some Sea FM stations were later sold to meet media ownership requirements.  Prime Television Limited purchased Sea FM Townsville in Queensland and Grant Broadcasters purchased Sea FM stations in Devonport and Burnie in Tasmania.  All Sea FM stations currently owned by Southern Cross Austereo except Cairns, Mackay and Rockhampton / Gladstone, are now considered part of the Today's Hit Network after Southern Cross Media merged with Austereo.

Austereo Radio Network: Austereo Radio Network formerly operated commercial radio networks in metropolitan and regional areas of Australia.  On 6 April 2011, Southern Cross Media purchased a majority of the company and is in the process of unifying the Austereo networks with Southern Cross's regional brands.  In July 2011, Southern Cross Media and Austereo were merged to form Southern Cross Austereo.

Maie Casey, Baroness Casey: Ethel Marian Sumner "Maie" Casey, Baroness Casey AC, FRSA (née Ryan; 13 March 1892 – 20 January 1983) was an Australian pioneer aviator, poet, librettist, biographer, memoirist and artist.  Richard Casey was her husband.

Lady Southern Cross: The Lady Southern Cross was a Lockheed Altair monoplane owned by Australian pioneer aviator Sir Charles Kingsford Smith.

Charles Kingsford Smith: Sir Charles Edward Kingsford Smith MC, AFC (9 February 1897 – 8 November 1935), often called by his nickname "Smithy", was an early Australian aviator.  In 1928, he earned global fame when he made the first trans-Pacific flight from the United States to Australia.  He also made the first non-stop crossing of the Australian mainland, the first flights between Australia and New Zealand, and the first eastward Pacific crossing from Australia to the United States.  He also made a flight from Australia to London, setting a new record of 10.5 days.

Peggy Kelman: Margaret Mary "Peggy" Kelman, OBE (6 April 1909 – 23 December 1998) was an Australian pioneer aviator.

Smithy (1946 film): Smithy (aka Southern Cross and Pacific Adventure) is a 1946 Australian adventure film about pioneering Australian aviator Sir Charles Kingsford Smith and his 1928 flight across the Pacific Ocean, from San Francisco, California, United States to Brisbane, Queensland, Australia .  This was the first-ever transpacific flight.  Kingsford Smith was the pilot of the Fokker F.VII/3m three-engine monoplane ""Southern Cross"", with Australian aviator Charles Ulm as the relief pilot.  The other two crew members were Americans James Warner and Harry Lyon.

Supporting paragraphs: Lady Southern Cross Charles Kingsford Smith
Answer: Smithy