Mr A Tis,
Don't know if you remember the BHX-JFK service which ended a couple of years ago?
The flight was practically paid for by belly cargo, the pax generated a profit. However, this relied on them using a 767. After a couple of seasons, London wouldn't release one so they ended up with a 757 which doesn't have the cargo capacity. I can't remember the exact figures but the 757 required a load factor >100% (people sitting on the wing I guess!) in order to break even! Smart planning there eh?
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Just want to say good luck, we're all counting on you .......