Thai-based low-cost carrier Nok Air has announced the resignation of the chairman of its audit committee Pimol Srivikorn, effective immediately. Srivikorn was also a director at the Don Mueang International Airport in Bangkok.

The resignation comes after the carrier reported a nearly 50% increase in losses for FY 2015, to THB723.9 million ($20.08 million).

In February, the carrier also saw cancellations of dozens of flights to destinations including Ubon Ratchathani, Chiang Mai, Udon Thani, Khon Kaen, Trang and Surat Thani. The airline apologized for the cancellations, saying they were “the result of an unpredictable incident … with pilots going on strike.”

Nok Air said at the time it had complied with Thai aviation standards and was “in the process of upgrading its standards to meet withIATA Operation Safety Audit (IOSA) and global safety management.”

During the service disruptions, Nok Air used charter aircraft operated by Thai Lion Air and Thai Smile on routes to affected destinations, and in late February issued a statement said there would “be no further flight cancellations taking place.”

However, Nok Air and several other Thai carriers have been ordered by the Civil Aviation Authority of Thailand (CAAT) to submit risk management plans for appraisal.

Thai transport minister Akom Termpitayapaisit said the plans will be assessed byCAAT for their ability to handle a variety of issues including pilot strike, natural disaster and information technology failure.

“I have [also] ordered the Civil Aviation Training Center to speed up an aviation personnel recruitment plan to help fix this [staff] shortage problem,” Termpitayapaisit said, adding he has also ordered an audit on Nok Air pilot flight hours.