A four-day strike by French air traffic controllers is set to affect travel across the continent.
Five unions have called the strike, starting from Tuesday, to protest against the plans to merge European air traffic control.
They fear the move will lead to jobs losses and cuts in civil servant benefits.
The strike is expected to cause travel disruption at Paris' Charles de Gaulle and Orly airports.
The French civil aviation authority DGAC said it could not estimate to what extent the strike could affect air traffic.
Last month, a similar strike led to cancellation of half of flights at Orly and 15% of flights at Charles de Gaulle as well as travel disruption in other French airports.
Meanwhile, Frantic efforts to head off a "deeply damaging" strike by British Airways cabin crew will be made today, with time running out to reach a deal.
Talks between leaders of Unite and BA managers are expected to be held hours after the union announced another massive vote in favour of industrial action in a bitter row over jobs and working conditions.
Unite will hold a series of internal meetings over the next few days before deciding whether to set strike dates, which would hit flights in the busy run-up to Easter.
© Press Association 2010