I suppose we'll have to wait and see how it will affect their behaviour exactly.
But Delta's current route expansion is clearly carried out under the protection of current bankruptcy legislation which others (i.e. non-US carriers) do not enjoy. In this sense it's false competition (as are subsidies) and unfair trade and I wonder if the WTO shouldnt have a look at it. I'm actually surprised it hasn't been challenged already before the WTO, though that may already have happened, I don't know.