Indeed jmccrew, which is why I emphasized the word most and not all. It is only a hunch but I would reckon that more than half (ie, most) of your pax wouldn't know the difference between a 757 and a 767. They probably would know the difference between a nine hour direct flight and an eleven hour flight that stops Goose Bay mind you.
And no, I don't own an Orlando property, though I've stayed in a couple and very nice they were too. Flew with AA and Delta. The irony was that the scheduled flights were cheaper than FCA's charter flights.
(BTW, in case you think I'm FCA bashing, I'm not. I will be utilising your service to Paphos in October. It should be a 757!)