Just for completeness sake, I'll add there are circumstances where you can get a credit good for a year, and even some cases where you can get a refund.

If you booked in F class, you can always cancel your flight without penalty and get a credit. If you booked in coach or MCS class, you can change your flight by paying a $75 penalty, which can result in a credit if the new fare is more than $75 lower (which it isn't in this case).

Also, VX has a refundable fare you can purchase in coach. If you use this, you can get a full refund when you cancel or change. There is also a government fare, which is always refundable and changeable without penalty.