Strikes by Air France flight attendants in the last five days have led to 900 flights being cancelled and 150,000 passengers affected through Sunday.
The week-long strike is expected to last until Tuesday evening.
On Monday, the French airliner expects 20 per cent of medium-haul flights to and from Charles de Gaulle Airport in Paris to be affected, but said it will operate more than 95 per cent of long-haul flights.
The call to strike by the two leading Air France unions was issued for July 27 to August 2 and seeks the extension of a labour contract on rules, pay and promotions that runs out at the end of October.
Air France pilots went on strike in June, during the first days of the Euro 2016 football tournament, which, according to the company's estimates, cost the firm 40 million euros (44.6 million dollars).