Flights to and from France are set to be affected by a 48-hour strike by air traffic controllers.
The industrial action by French air traffic controllers is due to start at 06.00 local time (05.00 British Summer Time) on Wednesday, April 8, and run until 06.00 local times (05.00 BST) on Friday, April 10.
The French Civil Aviation Authority has asked for airlines to reduce their normal schedules to key airports on Wednesday including the three major Paris airports, as well as Lyon, Nice, Marseille, Toulouse, Bordeaux and Nantes.
Air France said it expected to operate around 60 per cent of medium-haul flights to and from Paris Charles de Gaulle, while “almost all” long-haul services are expected to operate.
Hop, the airline’s short-haul subsidiary, is set to operate 60 per cent of its normal schedule, apart from Paris Orly where it is planning to run only one-third of normal services.
British Airways said it would try to use larger aircraft to help minimise the impact of the strike.
"Unfortunately in addition to cancelling some flights to and from France, other short-haul flights are also likely to experience significant delays throughout the two days, given how many flights would normally use French airspace," said BA in a statement.
"We will be using larger aircraft, where possible, to help affected customers and are doing all we can to reduce any disruption.
"We will continuously review the situation on Wednesday, April 8, and will look to publish our revised schedule for Thursday April 9 during Wednesday afternoon."
Easyjet said it had cancelled 118 flights to and from France on Wednesday, including 10 to and from the UK.
"Like all airlines flying to and from France, we expect significant impact to our flights during this period," Easyjet said in a statement.
"Easyjet can assure its passengers it is doing everything possible to limit the inconvenience of this strike on them. We are advising all affected passengers of any flight changes via email and SMS."
Ryanair said it had been forced to cancel more than 250 flights on Wednesday due to the industrial action.
“It's grossly unfair that thousands of European travellers will once again have their travel plans disrupted by the selfish actions of a tiny number of French ATC workers,” said Ryanair.
Details of the strike's impact on flights during Thursday are yet to be announced.
Unions representing French air traffic controllers are also planning to hold follow-up strikes on April 16-18 and April 29-May 2.