Airline passengers are facing cancelations and delays throughout this week due to industrial action being held by air traffic controllers in France.
Air traffic controllers, who are represented by the UNSA union, are planning to walk out for five days from 05.00 on Monday, March 6, until 19.00 on Friday, March 10.
DGAC, the French civil aviation authority, is expected to ask airlines to reduce their usual flight programmes by up to one-third.
Easyjet said in a statement to customers: "We are working to minimise the impact of the strike, but like other airlines flying to and from France there will be cancellations and potential delays.
"There is expected strike action for the rest of the week, once we have confirmation we will update you if your flight is affected.
"Although this situation is outside of our control, we do understand that it can be very frustrating situation for all customers travelling."
British Airways said it was not just direct flights to France that were likely to be affected.
"Unfortunately in addition to cancelling some flights to and from France, other short-haul flights may also experience some disruption, given how many flights would normally use French airspace," said BA.
"We are still assessing which services may be affected on each day of industrial action, but we recognise the uncertainty the situation is causing and have introduced a more flexible rebooking policy."
Ryanair was forced to cancel more than 40 flights on Monday (March 6) as a result of the strike including some servcies from the UK.
"Ryanair sincerely apologises for any inconvenience caused by these unjustified ATC disruptions which are entirely beyond our control," said the airline.