Air traffic controllers in France are expected to join the general strike in the country on the evening of October 9th until the morning of October 11th.
The CFDT, CGT, FO and Unsa unions have urged the country's 5.4million public service workers to walk out in protest over changes to France's labour laws.
France’s Civil Aviation Authority has requested airlines to reduce their flight schedules into the country by 30% on Tuesday, but the action will also impact on aircraft flying over French airspace.
Airlines flying between the UK and Spain warn that flights could be affected.
EasyJet have said, “As a large percentage of easyJet’s flights fly over France, this will have an impact on our flights to and from French airports, as well as those flying over French airspace.
“Just like other airlines we are subject to French air traffic regulations, we therefore expect delays and cancellations on both days.
Jet2 have also warned, "Jet2.com has been made aware of industrial action supported by the Air Traffic Services in France between 9th October 18:00 BST and 11th October 03:00 BST. As a result, flights operating to France or through France airspace may be subject to disruption.
Europe’s largest airline association has called for new measures to minimise the effect of French air traffic control strike action on travellers.
Ryanair and other airlines have repeatedly called on the commission to introduce measures which would minimise the impact of these frequent air traffic control strikes.