If a merchant wants to impose this kind of thing on a customer, the details, the "jist of the math" as you call it, must be posted somewhere in an intelligible manner accessible to the customer. But when the explanation of how the voucher works borders on gibberish, if he took the airline to court I don't think any Judge would have any difficulty in Ordering the airline to give him the full value of the voucher and leave you and your math out in the cold.
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