MONTREAL — Air Canada delayed or cancelled nearly 2,000 flights over the Canada Day long weekend in a potential taste of more trouble ahead for passengers. Roughly half of all trips by the country's biggest airline — including its lower-cost Air Canada Rouge and regional partner Jazz Aviation — were disrupted Saturday through Monday, according to figures from tracking service FlightAware. The 1,965 flight delays and cancellations — over 52 per cent of scheduled flights — stand in contrast to num