Australia's aviation regulator has opened an examination into Vietjet's financial viability, The Australian reports. The review puts the low-cost carrier's standing with a key international regulator under formal scrutiny at a time when the airline continues to expand its long-haul network.

The regulator has not yet published findings. Financial-viability probes of this type assess whether a foreign carrier holds the resources to operate safely and sustainably on routes under the regulator's jurisdiction, covering liquidity, maintenance funding and insurance cover.

Vietjet, Vietnam's largest private airline, has built its business on a narrowbody fleet anchored by the Airbus A320 family, with A321neo variants forming the backbone of its regional network. The carrier has also placed orders for widebody A330neo aircraft to support longer-range expansion.

What does this change for Vietjet?

For now, the probe changes nothing operationally. It signals, however, that a national regulator has sufficient concern about the airline's finances to begin a formal look at whether those resources meet the threshold required to keep flying its routes.

Outcomes of such reviews range from clearance to conditions on operations, depending on what the examination finds. Vietjet has not publicly commented on the probe, according to the report.

The scrutiny arrives amid broader pressure on airline economics in the Asia-Pacific region, where carriers face elevated fuel costs and uneven post-pandemic demand recovery. For Vietjet, a carrier competing aggressively on price across Southeast Asia and beyond, regulatory attention to its balance sheet adds a layer of risk to its expansion plans.

Further detail on the probe's scope, timetable and potential consequences is expected as the regulator's work proceeds.