New Guinea Moon by Kate Constable
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Julie has grown up not knowing her father, with just the occasional Christmas card and the knowledge that he flies planes for a charter company in New Guinea. When she comes to stay with him one long summer, she learns to appreciate not only her long-lost father and his love of flying, but also New Guinea itself and the people she meets.
An awkward romance with a young expat contrasts with her growing attraction to the son of a local coffee plantation owner. And, left to her own devices much of the time, Julie learns to rely on herself and gain her own independence. A tragedy and then a mystery leave her reeling, but force her to evaluate what she really wants out of life.