FA-66674 / Airline fare rule evaluation / Member archive

Non-refundable charges refunded on fully unused tickets · case 04

An unused ticket refunds its non-refundable carrier-imposed charge.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Input {'paid' base fare,'cancel_fee','used_fare','status' UNUSED|PARTIAL,'taxes':[[code, amount, refundable, used]]}. Fare portion = paid - cancel fee - (used fare only when PARTIAL), floored at 0 before taxes are added. Taxes are refunded only if refundable and not used. Return refund rounded 2.

Why this case matters

Refund calculation must keep the penalty from consuming refundable taxes and must only deduct usage for partially flown tickets.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
unused refundable	`501.2`	`421.2`	Failed

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