https://www.flyingblue.com/en/news/extend-your-flyingblue-miles
舊制：
Flight activities extend all of your Miles for 2 years.
Commercial activities extend only the Miles earned from Flying Blue partners for
2 years
新制：
Any activity (flight or commercial) will extend all Miles for 24 Months.
高卡、聯名卡、FB Extra訂閱維持永久效期
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