UA isn't going to fly TED on any city-pair on which they don't face nonstop LCC competition. TED, like MetroJet before it, is a strictly-reactive measure not intended to offer a lower-fare product *anywhere* the higher-CASM mainline product doesn't face direct competition. Icky low fares are not to be encouraged wherever it isn't necessary.
also experimented with flights from LGA
to Upstate New York in 1984. I remember that for a few months then, UA
flew four nonstop dailies on ROC
. But USAir and Empire were established in that city-pair at the time, so UA
couldn't make a go of it. More high-CASM network-carrier or regional-carrier capacity wasn't needed.
However, the following year, People Express entered ROC
, and demand to the New York market skyrocketed. More demand was there, it just needed the right price. As JetBlue is reminding us today.