Originally Posted by
Zorak
Mostly agree, though noting for the record that DL did have that brief experiment where one of the daily JFK-LAS frequencies was marketed as D1 (the same time that they were also doing one daily JFK-SAN and I think one or two others)
EDIT: oh, I replied w/o looking and forgot the original question was about PHL
nvm
It's relevant. DL also experimented with SEA and has occasionally put lie-flats on PHX-JFK. B6 flies lie-flats to LAS, but they're not a model for anything except how not to make money.
What UA, AA, and DL have all learned is that there are very few US markets which will support fares justifying regular lie-flat service.