Wokers across the European Union are staging a series of protests and strikes against rising unemployment and austerity measures.
General strikes in Spain and Portugal have halted transport, businesses and schools. Police and protesters have clashed in Madrid.
Smaller strikes were reported in Greece, Italy and Belgium, and rallies were planned in other countries.
Hundreds of flights to and from striking nations have been cancelled.
Airlines are recommending that passengers check schedules before setting out to airports.
British Airways and Easyjet were among the UK carriers forced to cancel some of their services.
A spokesperson for Heathrow airport told the BBC 36 flights had so far been cancelled due to the strikes.
The European Trade Union Confederation has co-ordinated the Europe-wide action.
The confederation’s Judith Kirton-Darling told the BBC that austerity was not working.
“It’s increasing inequalities, it’s increasing the social instability in society and it’s not resolving the economic crisis,” she said.
Some 40 groups from 23 countries are involved in Wednesday’s demonstrations.
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