AA american airlines美国航空 里程有效期？另外海航

How can I keep my miles active so they don't expire?
All you need to do is earn or redeem miles on American Airlines, American Connection, American Eagle, or an AAdvantage participant at least once every 18 months, and your mileage expiration date will automatically be extended for an additional 18 months from the date of your most recent account activity.

海航只是有意向加入，但是实际操作我看起码要5年左右,现在操心也没用，one world在亚洲地区不实用啊唉，在北美还行。

How can I keep my miles active so they don't expire?
All you need to do is earn or redeem miles on American Airlines, American Connection, American Eagle, or an AAdvantage participant at least once every 18 months, and your mileage expiration date will automatically be extended for an additional 18 months from the date of your most recent account activity.

海航只是有意向加入，但是实际操作我看起码要5年左右,现在操心也没用，one world在亚洲地区不实用啊唉，在北美还行。