The ACCC's original proceedings against Garuda and Air New Zealand were dismissed in 2014 in a ruling that found the behaviour didn't occur in a "market in Australia" as was required by the Trade Practices Act 1974 that was in force at the time.
The ACCC appealed that ruling to the full court of the Federal Court.
The regulator said matters against the two airlines had been remitted to the court to determine relief to be granted, including declarations, injunctions and penalties.
The Australian action is one of a number that has embroiled major airlines, including a US class action filed in 2006 on behalf of six freight forwarders and has been led by global litigation firm Hausfeld that has seen 26 carriers cut settlement deals totalling US$1.19 billion. In that case, Air New Zealand and Air India are the only carriers left defending the civil lawsuit.
In New Zealand, the Commerce Commission reached settlements with 11 carriers, including Air New Zealand, securing penalties totalling $45 million, or about 10 percent of the revenue generated from air freight forwarding services in and out of New Zealand in 2006.