Air traffic controllers, firefighters and other workers at Spain's 47 state-owned airports will stage a one-hour strike today to protest privatisation plans, their union said.

The strike, between 9:00 am and 10:00 am (1330 IST and 1430 IST), was a "first warning" to the government of Prime Minister Jose Luis Rodriguez Zapatero, Spain's largest trade union, CCOO, said in a statement.