There is no voucher, this discussion is stuck on a "term of reference"! This is a Virtual/Electronic ticket. In the absence of any "real" document people call it what ever they desire, hence voucher, credit, credit bank - what ever works when they think of it. The money left over is governed by the conditions of the airfare it was bought it under (Tariff, Rules and Regs, Contract of Carriage, Conditions of Sale - they are all the same thing). The details are all on the purchase receipt which can be printed at the time of purchase and anytime the purchaser requests.
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