Simple Answer, These other airlines are evidently able to make a profit at that fare level, [Thanks to the crooked bankruptcy courts],Simple question then...if Southwest "sets" a fare of say $200 on a route, and they have these fuel hedges that are eating away profits of other airlines...what's the theory behind those airlines charging $150 for the same trip?
Due to the rising costs at Southwest [erosion of fuel hedges], I would say that Southwest can no longer make a profit at the $150.00 fare in your above example.