Iberia faces a series of strikes during the run-in to Christmas in protest against deep cuts planned by owner IAG.
Industrial action is planned for six days between December 14 and 21.
Members of the pilots’ union Sepla are barred from participating in the strikes but others due to be involved include cabin crew and those involved in aircraft maintenance and baggage handling.
Final confirmation of the strikes is due tomorrow (Thursday). Detailed talks between management and unions about the plan are due to start today.
Sepla said it expected other unions representing cabin crew to join the industrial action, in moves that could ground most of Iberia’s aircraft.
“We really think this [IAG’s turnround] plan will destroy Iberia,” said Justo Peral, Sepla’s main representative at the Spanish carrier.
IAG chief executive Willie Walsh said earlier this month that Iberia was in a “fight for survival” and warned of deeper cuts if no agreement was reached with the unions on restructuring by the end of January.