Flights to and from France face delays and cancellations due to a national strike in the country.
Transport is being targeted in the latest wave of industrial action over planned pension reforms.
The day of national action comes just two days after unions and the French government resumed negotiations.
The Foreign and Commonwealth Office said in updated travel advice: “Strike action across France continues.
“On Thursday 9 January and Saturday 11 January there will be a further call by unions for widespread industrial action and demonstrations across France, including to transport.
“If you’re due to travel on these days, check with your travel operator for further information. Avoid demonstrations wherever possible and follow the advice of the local authorities.”
EasyJet warned: “We have been advised of a national strike in France starting at 18.00 local time Wednesday, through to 05.30 Friday.
“Some air traffic control staff are joining the strike action and therefore like all airlines, our flights to and from French airports, as well as those flying in French airspace, could be affected.
“We expect that there will be delays and cancellations due to the industrial action, therefore we advise all customers to check the status of their flight on our flight tracker either on our mobile app or website.
“Please also be aware that public transport services will be affected by the strike.
“We recommend all customers allow plenty of extra time to get to the airport and consider alternative transport options where possible.”
The state-owned SNCF rail company will be “severely disrupted” in the Ile-de-France region and warned that “large crowds are expected at stations”.