Finland's state-controlled airline Finnair said it would cancel 15 flights on Monday due to a strike by Finnish airport service workers.
Service workers went on a five-hour strike on Friday and the action is likely to be expanded on Monday after trade unions and business representatives failed to resolve a pay dispute.
"The strikes and support strikes taking place on Monday ... will have a significant impact on Finnair's operations despite the fact that Finnair is not in any way a party to the labor dispute," the company said in a statement on Sunday.
The canceled routes were mainly domestic, while one was between Helsinki and Gothenburgh, Sweden.
Finnair said all passengers should also prepare for delays on Monday.