I received a Delta voucher for volunteering to give up my seat last Sep. The voucher has a 1 year expiration. Does that mean I need to book a flight with it by Sep 2011 (where travel dates could extend beyond Sep 2011) or does it mean I need to book& complete a flight that occurs prior to Sep 11? r I had intended to use the voucher this May to go to Italy, but flight prices were way too. I'm hoping to use the voucher in November instead, just want to make sure it's still good.