Chief executive Alan Joyce has demanded Canberra halt a capital raising by Virgin Australia, which is already 63 per cent owned by Singapore Airlines, Air New Zealand and Abu Dhabi-based Etihad.
He claims it will destabilise Qantas, charging that the Aus USD 350 million (USD 328 million) raised by its main domestic rival could boost foreign ownership in Virgin Australia to up to 80 per cent.
"No other country on Earth would passively allow such a foreign takeover to happen," Joyce wrote in a memo to staff cited by The Sydney Daily Telegraph.
The memo was followed by an online petition -- fairgo4qantas -- which has so far attracted more than 5,000 signatures to support its campaign.
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"As Qantas staff and supporters of Qantas, we are proud of our airline and we know that in any fair fight we will come out on top," it reads.
"However the unfair playing field in Australian aviation is a risk to the future of Qantas and all our jobs.
Virgin Australia has argued that it has worked hard to build its business, saying the landscape of Australian aviation had changed forever and was no longer a monopoly.
But Joyce said Virgin had been losing money for months,
driven by a strategy of setting uncompetitively low prices to win customers from Qantas.
"With the benefit of unlimited sovereign funds -- including the recent injection of a further $300 million -- Virgin can set prices below a competitive level simply because, unlike us, they don't need to make a profit," he said.