If the motivation for the strike is that people in Air France will ultimately be forced to work to 65 by the pension rules as Rageye says, then I can understand a bit better what this is about.
I know this issue has led to strikes in the railways in France. Is this really the issue?
As an aside there is nothing unusual about laws being passed in the middle of the night. I don't think that is a relevant objection.
On the other hand if people can work until 65 if they want to but are not forced to, then I cannot see there will be much sympathy.