SINGAPORE — Swedish aerospace manufacturer Saab has proposed that a hypothetical Gripen production line in Canada would be large enough to also serve export customers besides making planes for the Canadian Air Force. The statement is the latest effort by Saab in sweetening the pot for Canada to give the Swedish company a slice of its fighter jet business. “We need to ramp up our [fighter jet] production capabilities, to a level where it’s not only for Canada – we do see that [the potential line]