The fuel pipeline to Paris's main airports has been shut off amid strikes over government pension reforms.
The company that operates the pipeline told French media that the capital's main airport, Charles de Gaulle, could run out of fuel as early as next week.
There are fears of fuel shortages as all of France's 12 oil refineries have been hit by strikes, and many oil depots remain blockaded.
Unions are opposed to government plans to raise the retirement age.
Trapil, the firm that operates the pipeline to Paris's airports, said supplies had been cut off on Friday.
A company spokesman told AFP news agency: "Orly airport has stocks for 17 days, and Roissy [Charles de Gaulle] for at least the weekend".
The pipeline is supplied by the Total refinery at Grandpuits, in Seine-et-Marne, which is in the process of stopping production because of the strikes.
A spokesman for Aeroports de Paris, the authority that operates both airports, told Reuters news agency it was "not at all worried about stocks" - but did not say how long these would last.
BBC News
