Jet2 Airlines and easyJet have issued a warning to people travelling to and from France this week.
Tensions within the French government have prompted protests and strikes in various sectors including aviation. It comes after President Emmanuel Macron used special constitutional powers to force through an unpopular bill raising the retirement age from 62 to 64.
In France, Air Traffic Control has confirmed strikes until Friday, March 24. This means flights to and from French airports, as well as those flying in French airspace, could be affected.