Powers, who joined in January 2018, resigned for personal reasons and has decided to return to the United States, Etihad said in a statement confirming an earlier Reuters' report.
He has been replaced in the interim by senior Etihad finance executive Adam Boukadida, the airline said on Tuesday. Etihad said it was searching for a permanent replacement.
Abu Dhabi's Etihad airways posts losses for third year
Etihad did not say when Powers left the airline. Boukadida has served as interim Group CFO since March, according to his LinkedIn profile.
Powers was hired as the airline embarked on a five-year turnaround plan after a strategy of buying stakes in other airlines collapsed, contributing to billions of dollars in losses.
Group Chief Executive Tony Douglas said in 2018 Powers would "play a pivotal role in helping to guide Etihad onto the next stage of its development".
Etihad reported a $1.28 billion loss for 2018, down from a $1.52 billion loss in 2017. It has lost $4.75 billion since 2016.
Indonesian woman gives birth on Etihad flight
Powers, a former JetBlue CFO, was hired by Etihad following a major shake-up of management that included the departure of long-serving Group CEO James Hogan and Group CFO James Rigney.
The airline, which launched a five-year turnaround strategy in 2017, trimmed its ambitions and started reorganising as a mid-sized carrier focused on point-to-point traffic in 2018.
This year, it canceled dozens of Airbus and Boeing aircraft orders worth tens of billions of dollars.
Powers headed the finances of Etihad Aviation Group (EAG) which oversees Etihad Airways, engineering, airport, travel services units and its investments in other carriers.
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