Hong Kong (CNN Business) Doubts about the future of the Airbus A380 have grown after yet another airline canceled an order for the superjumbo jet.

Qantas QABSY Australia'ssaid Thursday that it had scrapped longstanding plans to buy eight more of the double-decker planes

Airbus EADSF The A380 has been a major disappointment for, racking up less than a quarter of the sales the European company forecast when it first introduced the giant jetliner more than a decade ago. The underwhelming demand has fueled questions about how long the manufacturer can justify continuing production of the iconic aircraft.

Airlines like Qantas have shifted their interest to lighter, more fuel efficient passenger jets.

"For Qantas, the A380 is the aircraft of the past and not its future," said Ellis Taylor, Asia finance editor at aviation intelligence firm FlightGlobal.

Read More