Why do you insist in making transatlantic flights?
The big airlines are doing that already and you can not go head to head with the big ones.
As most of us post to you, you must find niche markets's, for example, instead of using one 767 in that route you want, use 3 or 4 small jets (ex:EMB145) doing regional flights were they are NEEDED. As your airline growth up, you may introduce new routes and new planes.
It seems to me that you want to "fly high" very soon but you must wait, have some patience. Remember that a big climb can led to a big fall.
I don't want to be the pessimist one, but you must think in all factors before start with such an important project.