AirAsia X has denied allegations that it sought personal favours or gratification from jet engine manufacturer Rolls-Royce PLC.

"AirAsia X, its directors and officers have never sought personal favours or gratification from Rolls-Royce other than to negotiate for the best possible commercial and financial terms for the benefit of the company," the airline said in a filing with Bursa Malaysia today.

Meanwhile sister company AirAsia Bhd, in a separate filing, said it never had dealings with Rolls-Royce.

AirAsia X and AirAsia Bhd are both banded together under the AirAsia Group umbrella.

It was reported that UK's Serious Fraud Office (SFO) had named AirAsia Group as one of several foreign parties involved in bribery cases with jet engine manufacturer Rolls-Royce PLC.

The bribery in the AirAsia deal was one of 12 charges brought against Rolls-Royce after a four-year investigation into its dealings with clients in Indonesia, Thailand, India, Russia, China and Malaysia.