I promise I am not making this all up and have a link to back up what I am saying.
I have 13 credits in my account. I called to see if the schedule would be extended to Sept. by Friday when 6 of my 13 credits would expire. She said no. So I asked what my options were. Here they are:
1. Pay to extend my vouchers. At $29 a credit that would be well over the price of what I would pay for a one way ticket.
2. Redeem credits for upgrade vouchers. These are redeemable for one year from the date that I cash in my credits for a voucher.
3. Book for a flight already open on the schedule and then when September opens call and ask them to change my flight. Problem here is that I have heard they quit doing this (on Flyertalk) and the website does say:
When you say you redeemed for a voucher in July and used it in August - did you get a voucher and then book your ticket in August or did you use your miles in July to book a flight in August?
Here is a link to the Aitran page explaining all of this:
http://www.aplusrewards.com/a_plus_news.aspx