Even though DL follows what is being discussed here, I do not think that they at all care about cultivating the crowd that gathers here. They have little respect for the LUT flyers (as the recent DEQM promo shows) and have no interest in putting these people into its premium international cabins.

That being said, I believe that no airline takes better care of its domestic business travelers. This opinion comes from one who has been top tier in three different programs over the past 6 years and has settled on DL as the best deal for his travel patterns.

It is true that when it comes time to travel internationally on leisure, it requires quite a bit of finesse and the use of lots of miles. But it can, and is done that way. Of course I would like the PMUs to be easier to use but that is far from crucial.