That date should be your first clue...
first took to New York's skies, they've wanted a way to combat BA
's Concorde service. The most commonly proposed idea (shy of bumming SSCs from AF
) was an all-J service of some form or other.
Nowadays, in the post Concorde/9-11 era: VS
has very little incentive to offer such a route from LHR
to America, as it would accomplish little other than trashing the yield on their standard-configured flights.