I'd like to know where you obtained those numbers, Airtime, because they are not at all accurate.
Canada 3000 has grasped a large percentage of the charter market with their A330-200 (i know AT has the same type, but it has not boosted Transat's passanger flow nearly as much as it has for C3) as well as their newly opened C3Holidays, as Buff stated. Canada 3000 has done a much better marketing job in the last year or so and it has payed off.
I cannot remember where I had read this report, but if I come across it i'll make sure to post it. C3, although previously in a tight race with AT, does have the number 3 spot in canada.
With rumours of Royal Aviation going bankrupt, who knows what the future holds. It'll be an interesting ride, I can assure you, with Air Canada's recent plans with Canadian affecting the Canadian Transportation industry as well.
Until that time, however, i'll enjoy very fair airfare's with great service on Canada 3000, one of my favourite airlines, by far. Well, except for the paintscheme