For an answer, i believe the withdraw date is the last date the manufacturer will receive your order. Therefore, you will still get the plane you ordered and the aircraft will still be able to fly as long as you want. No refund, no scrap and no plane disappear.
btw, dktc, don't get angry with me, but i think your answer is a bit too hostile sometime. May be he just asked because he doesn't understand sth, that's what the forum for isn't it...