Some months back, I wrote Customer Relations regarding a problem I had with AmericaWest (there've been so many I can't remember the specifics). In the letter I stated that I use the website exclusively to book my travel and did not want a "We're sorry" travel voucher.
Of course, that's exactly what I received.
Just this week I emailed Customer Relations to ask the very same question you posted. Here is the response I received yesterday:
"At this time, vouchers and certificates including the Future Travel Awards, More Care Air Check Plus coupons and Transportation Vouchers cannot be redeemed on the web site or applied toward the purchase of online fares.
As stated in the "Terms and Conditions", the award must be redeemed in person at an America West Ticket Counter at the time of ticketing.
Pat Faino
Customer Relation
America West Airlines"
Seems to me there are several scams we allow AmericaWest to get away with.
Another is a Denied Boarding Compensation voucher for high dollars. In the case of a $500 voucher where the published fare is $198, no credit, reissue or refund of the voucher is made for the difference of over $300!
I'm wise to you, AmericaWest!