America West has poor vouchers, IMO. No residual value...important to know, especially if they say $500-$700. Didn't find out later and we would be hard pressed to spend that much on one ticket. We were planning to split it up. Can. Lowers the value. Can't earn frequent flyer miles on the voucher as well--so it says. Keep these factors in mind.

residual value is very important. CO says no way, no longer, but can get miles. Also, CO will not allow, in policy, for you to combine the voucher i.e., "certificate" with other coupons. Thus not like money.

NW and AA, I believe, have residual value and treat the vouchers more like cash.

Such details are an important factor in bumping...

JL2