Air France is balloting staff over its offer of a 7 percent pay rise over four years, after unions rejected the proposal as too modest. Chief Executive Jean-Marc Janaillac has said it would be hard for him to stay if staff vote against the offer.
Philippe said Janaillac had shown "courage" by putting his job on the line and warned that a negative vote could further harm the company.
"If the consultation did not produce the results he hoped for and he took the consequences, everyone should fasten their seat belts because the turbulence will not be minor," he told Europe 1 radio. "A company that loses its boss in these conditions is not well placed to face the future."
SNCF workers have launched a series of protests against reform plans by President Emmanuel Macron's government, designed to stem the state-owned railway's losses and cut debt.
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