QANTAS'S horror quarter has continued, with an admission from the airline it was "likely" guilty of price-fixing.

The US Department of Justice has cast a wide net into airline collusion over freight prices. This has already lead to British Airways and Korean Airlines being fined millions of dollars.

The anti-trust probe now has Qantas in its sights, and the flying kangaroo has nowhere to hop.

Chief Executive Geoff Dixon has said in the past that Qantas "may" have breached competition laws.

"We have said there is a potential liability, but we are not able to quantify the matter as yet," Mr Dixon said.

However, documents from an internal Qantas investigation are more definitive.

"During this investigation Qantas learned that the practice adopted by Qantas Freight, and the cargo industry generally, to fix and impose cargo fuel surcharges is likely to have breached relevant competition laws," Qantas noted.

On February 1 the airline was notified of an action related to alleged cargo price fixing which was filed against it and other carriers in the Australian Federal Court.

On February 9, Qantas was separately advised that it had been named as a defendant in a US District Court class action in New York.

The US action against the British and South Korean airlines is the first to arise from the anti-trust division's investigation into the air transport industry.