At least the airline industry now has the answer.
Bottom line is all airlines have a duty of care and in my opinion that is a good news story.
The ash cloud may have been an Act of God but it wasn't up to God to look after the passengers.
The Ash cloud could quite easily have seen the demise of some airlines. Why should only the airlines pick up the bill? So the Ash cloud stranded you but you don't want to share any of the financial burden.
And as "God" doesn't actually exist how can this be used as a defence by the insurers?