State-owned carrier Croatia Airlines will likely have to cancel 30 flights, or around half its schedule, during a planned 24-hour strike by most employees due to start at 0500 GMT Thursday.
Croatia Air's website said on Wednesday it will operate 26 flights during the strike -- a local law obliges the airline to keep operating some flights during a strike.
"Management will issue a statement regarding the strike later today," spokesman Davor Janusic told reporters.
Employees at four of the six unions represented at the carrier are protesting about the outcome of talks over rights defined in the collective agreement, and also about poor management resulting in losses and indebtedness.
Croatian posted a 2011 net loss of HRK75.8 million kuna (USD$13 million), narrower than its 2010 loss, while passenger numbers rose 15 percent. Management has said it is planned to reach profitability in 2013.