Thai budget carrier Nok Air will cancel 20 domestic flights on February 23 even as it faces an investigation into earlier cancellations and the threat of having its license suspended.
An official at the airline told Reuters news agency that passengers affected had been contacted and offered compensation or alternative flights.
"These are normal cancellations and we informed passengers three days in advance, which is in line with the (transport) ministry's regulations," she said.
Nok Air is under investigation by the Civil Aviation Authority of Thailand after 3,000 passengers were affected by flight cancellations last Sunday following a pilot strike.
On Monday, Deputy Transport Minister Omsin Chivapruek said Nok Air's operating license could be suspended if there were more flight cancellations.
Thailand is under pressure to improve its aviation standards after the US FAA downgraded the country's safety ratings in December last year.