Unions are threatening to bring Geneva Airport to a standstill next Thursday if the board votes to accept a new pay deal.
Unions say it will mean a cut to bonuses and a pay freeze.
Airlines have been warned the action may mean some flights will have to be diverted.
The action will impact security controls.
Unions say they expect workers will support a strike call as 300 attended a meeting to discuss action.
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This winter was significantly warmer than average
