Prosecutors have conceded shortcomings in their murder case against an ex-pilot, after being accused of running an unfair trial where they "chickened out" of properly challenging the killer.

Greg Lynn, 59, sat inside a packed Court of Appeal in Melbourne for the first day of his challenge against conviction and sentence, after he was found guilty of one murder and acquitted of another.

The former Jetstar pilot wore glasses and a suit, and clung onto his notebook as he was escorted into the dock by custody officers in front of a packed courtroom of journalists, authors and observers.

Seated behind him were family members of the woman he has been convicted of murdering, Carol Clay, 73, and the man whose murder he was acquitted of, Russell Hill, 74.

The pair had been camping at the same r

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