AAA Airlines, an accrual-basis taxpayer, frequently issues travel vouchers to customers who voluntarily surrender their reserved seats on overbooked flights. The vouchers are for a specific dollar...

AAA Airlines, an accrual-basis taxpayer, frequently issues travel vouchers to customers who voluntarily surrender their reserved seats on overbooked flights. The vouchers are for a specific dollar amount that customers can use to reduce the purchase price of future tickets. The vouchers are valid for one year and many expire unused. Explain how AAA Airlines should account for these vouchers for both financial accounting and tax purposes.