No shows are people who have not checked in their flight before the gate closes. You will miss your flight and a NOSHO tag will be added to your PNR. If you leave the PNR as is, your Eticket coupons will all be listed as FORFEIT ...and this, is not good as the ticket is no longer usable, no exceptions.

Best thing for you is to call the AE desk and pay the 55 CAD change fee per person so they can replace your unwanted flight with an open jaw.

Radarbeam