The SNPNC and the Unsa-PNC unions said on Thursday that they were planning to go ahead with a strike from July 27th to August 2nd.
Depending on what time of day the strike begins (and ends), this means that Air France passengers may be facing a strike that lasts seven days.
The two unions, which represent around 45 percent of the company's stewards and air hostesses, called for the strike after failed negotiations on Thursday with Jean-Marc Janaillac, the new CEO of Air France–KLM who started in the role this week.
The third largest union, Unac with 22 percent of workers, also had representatives at the meeting but decided to postpone their call to action until October.
If the July/August strike goes ahead, Air France will be severely hit as the week marks a crucial period for travellers keen to head on a mid-summer holiday.
The Air France workers are pushing for better working conditions, most notably trying to negotiate the finer points of their contract renewal process.