Rayani Air (Langkawi) has been warned by Malaysian Minister of Transport, Datuk Seri Liow Tiong Lai, that it risks being sanctioned should it fail to improve its operational record.

Liow told reporters last week that his ministry would launch thorough investigations into the airline's operations after it received numerous complaints from passengers concerning the start-up's handling of flight delays, alleged sub-standard service, as well as the cancellation of a Langkawi-Kuala Lumpur International flight on February 9.

“Rayani Air has been cancelling flights without due notice. They have also repeatedly failed to provide replacement flights," he told the New Straits Times. “We’ve given them a warning and they have to comply with [Department of Civil Aviation] regulations."

Other complaints centred on Rayani Air's issuance of hand-written boarding passes which Liow said could pose a security threat.

The self-styled Shariah-compliant carrier began operations in late December using a pair of ex-Malaysia Airlines (MH, Kuala Lumpur International) B737-400s to ply domestic Malaysian routes.