a number of things spring to mind here intitially.
firstly; canada has never had it`s airspace attacked, unless you include pigeons.
secondly; what`s wrong with the jets we got recently?
and finally; if we do get attacked, the americans will protect us...it`s in their best interest to do so as we border with them not fifty miles from where i type.
as an addendum, to those paranoid types....if the americans are the ones attacking, it won`t matter that we have a few new jets, because they will have two trillion of them....so i recommend saving the money and doing something useful with the money, like helping the city of burlington finish it`s new pier. (they seem to be struggling a bit).