in a strike situation: give absolute priority just to get on a flight on another carrier (CP) that will take place, and check-in early.

another guerilla tip: if you want to increase your chances "not to be bumbed" from an overbooked flight: order a special meal!(best bet is a kosher meal) they will not bump you, because they can't organize that special meal for the next flight (but remember, special meals also reduce your chances for upgrades!).