FA-66678 / Airline fare rule evaluation / Member archive

Used-fare deduction applied to unused tickets · case 03

An unused ticket carrying a stale used-fare estimate refunds less than it should.

Member previewVariant 3 · 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 with stale used estimate	`467.0`	`670.0`	Failed

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