The Abu Dhabi-based airline has itself come under attack from US rivals over subsidies.
"US airlines have received benefits valued at USD 71.48 billion, more than USD 70 billion of which has been since 2000, enabling the nation's three largest carriers to transition from the verge of bankruptcy to today's industry leaders," a statement from Etihad said.
Last year, the three largest US carriers posted profits of almost USd 9 billion, close to half the gains racked up by the entire worldwide aviation industry, the airline added.
They called on the US government to open new talks over bilateral air agreements to address what they said are violations of those pacts, giving the Gulf carriers unfair competitive advantage.
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Etihad general secretary Jim Callaghan said his airline's study was not intended to criticise the subsidies US competitors received.
"We simply wish to highlight the fact that US carriers have been benefitting and continue to benefit from a highly favourable legal regime, such as bankruptcy protection and pension guarantees, exemptions from certain taxes, and various other benefits," he said.