现在只有靠飞行才能延期里程，不能再通过其他方式（比如兑换、合作伙伴消费）延长有效期了。大家一定要注意自己的里程情况，避免过期作废。
官网说明如下：
The validity of your Etihad Guest Miles depends on your Tier Status:
Etihad Guest Bronze, Silver and Gold Tier members: Your miles are valid for 18 months. These can be extended to an additional 18 months by flying with Etihad Airways or any partner airline.
Etihad Guest Platinum, and Emerald Tier members: Your miles will never expire.
You can easily check your miles balance, miles validity and transaction history by either logging in to your Etihad Guest account or subscribing to our monthly e-statements
大家要留意里程有效期，合理安排航班使用，不要让辛苦攒的里程白白浪费啦
