Pilots at Air France have voted in favor of strike action over pay conditions, the head of the SNPL union said on Monday.

SNPL chief Philippe Evain said more than two-thirds of the union's pilots with Air France approved the principle of a lengthy strike but said that no date had been set for the walkout.

The strike was in protest against the airline's "obsessive reduction of costs," Evain said. It comes after the pilots union rejected proposals from Air France in talks over productivity in April.

It was not immediately clear whether the timing of the walkout by pilots would coincide with the current wave of public transport protests and oil sector strikes against government plans for labour law reforms.

But the threat of France's flagship airline grounding flights will be a further headache for President Francois Hollande's Socialist government ahead of the June 10 start of the Euro 2016 soccer tournament, which is expected to draw 2.5 million people to stadiums around the country.

Air France-KLM declined to comment.

Other strikes in the coming days will target trains, the Paris subway system and ports.

Unions are tapping months of public anger over a labour bill that would make it easier for employers to fire workers and lengthen the working week.

They're hoping the timing of the walkouts, which start with train service Tuesday, will increase pressure on the government to withdraw the bill.

Several Strikes This Year

Signs emerged in recent days that both sides might be ready for compromise, after Prime Minister Manuel Valls spoke with the head of the CGT union, whose hard-left flank is leading the protest movement.

The degree of strike-related chaos will depend on how many workers take part. Unions have staged several strikes this year, but typically only a minority of staff participates, and a 2007 law requires a minimum level of service on all transport during strikes.

Workers at the SNCF rail authority — whose service will be crucial to Euro 2016 spectators — go on strike starting Tuesday night. The Paris transit authority, RATP, starts striking Thursday. Air traffic controllers are threatening to join in starting Friday.

Fuel shortages are another concern. Striking workers have blocked or slowed production at most of France's eight refineries, and disrupted oil imports at ports around Marseille on the Mediterranean and Le Havre on the English Channel.

Blockades at fuel depots last week caused nationwide gasoline shortages, but the situation has eased somewhat since the government ordered police to clear out protesting workers. Picketers had been blocking an oil depot in Port-de-Bouc near Marseille, but police ended that protest Monday.

Unions in each sector are negotiating for different demands specific to their workers, unrelated to the overall labour bill. But the bill has become a rallying cry. The government argues France needs the reform to survive in the global economy but critics say it strips away hard-fought worker protections and won't create the jobs it promises.

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