Malaysia Airports (MAHB) is pushing AirAsia and AirAsia X to pay around MYR42 million ($10 million) in debts relating to a July court victory against the two carriers.
The two carriers disclosed in stock exchange statements that MAHB had filed a garnishee execution application against them on 18 July. It also took further action in August by serving the carrier's banks with a separate court order directing them to "set aside certain funds for the purposes of payment of the judgement sums."
Copies of the orders were also served to its solicitors on 10 September.
Both carriers indicate that they plan to take "necessary actions" to preserve their interests, but did not elaborate further.
The Malaysian High Court ruled on 18 July that AirAsia and AirAsia X pay MAHB MYR40.7 million in unpaid passenger service charges, and MYR792,400 in late payment charges, after the airlines failed to have the case dismissed.
A declaration was also made for the airlines to pay MAHB the PSC rates that are gazetted in law.
The dispute relates to Malaysia equalising its passenger charges for Southeast Asian passengers departing from the main and KLIA2 terminals at Kuala Lumpur International airport since the start of 2018.
AirAsia and its long-haul affiliate have argued that as KLIA2 is a low-cost facility, it should not have to pay the same passenger charges as the main terminal.
Since then, the Malaysian government has announced that it will lower PSCs at KLIA2 and other airports in Malaysia.