The issue is really about EU law and employment. MO'L is up to his usual tricks, he's working towards a judge forwarding the case to the ECJ, no French judge will do it, they know they'll lose....
I believe there are more people employed across EU with French companies on French contracts than the small numbers employed by Ryanair.
This has nothing to do with Employment law as if it did then France would have acted against companies many years before who have people employed in France under UK contracts.
This is about looking after Air France purely and simply.