Air France's chief executive, Jean-CyrilSpinettaJean-Cyril Spinetta, has also suggested buying bigger planes to save costs by cramming more passengers on-board.
It was signed by some of France's most high-profile chief executives, including Christophe de Margerie of oil firm Total, Frederic Oudea of bank Societe Generale, and Air France's Jean-Cyril Spinetta.