Air France-KLM boss Jean-Marc Janaillac announced his resignation Friday after staff at the carrier's French operations rejected a pay deal aimed at ending months of walkouts.
Janaillac, who had been in the post for under two years and staked his future at the company on staff accepting the deal, deplored their decision as a 'huge waste'.
In early bourse business Air France stock was down nearly 13 per cent at 7.08 euros.
Staff and management at the carrier have been locked in a dispute over pay since February.
Air France says 7 days of strikes cost company 170 million euros
Intermittent strikes in recent weeks have prompted the cancellation of a quarter of flights on average.
Unionised staff are set to walk out for the 14th day on Monday as they press for a 5.1-per cent salary increase this year as the company recovers from years of losses and restructuring.
France's economy minister on Sunday warned that the survival of Air France was now in the balance.
Air France unions announce new two-day strike
"I call on everyone to be responsible: crew, ground staff, and pilots who are asking for unjustified pay hikes," Economy Minister Bruno Le Maire told the BFM news channel.
"Be responsible. The survival of Air France is in the balance," he added.
He warned that the state, which owns 14.3 per cent of the group, would not serve as a backstop.
"Air France will disappear if it does not make the necessary efforts to be competitive," he warned.
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