Premise: "Big Jet Plane" is a song written by Australian singer/songwriter Angus Stone, and originally recorded by Stone, under the name "Lady of the Sunshine", on his 2009 album "Smoking Gun". It was then re-recorded by Stone and his sister Julia, as the duo Angus & Julia Stone, and released on their 2010 album "Down the Way", as well as their 2010 EP "Big Jet Plane".
Hypothesis: Big Jet Plane was written by Stone's sister Julia.