Two of this fleet were lost in accidents: Southern Cloud in the Toolong range of the Australian Alps on 21 March 1931 (the wreckage was not found until 1958) and Southern Sun in Malaya in November 1931, while attempting the first airmail flight to the United Kingdom.
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They were in Avro 618 Tens, the City of Sydney and City of Brisbane, with Charles Kingsford Smith in the Southern Cross.