先要把两个帐号连起来，还有500mile bonus拿。看条例应该会转到DL的账户张
地址如下 https://www.nwa.com/worldperks/acctlink/
目前来说DL->NW不会延长你的有效期
Link accounts, transfer miles. After linking your accounts, you can begin to
transfer miles from one account to the other. You may transfer as many mile
s as you want in either direction–as many times as you want–as long as the
miles are there to transfer.Or you may choose to only link your accounts and not transfer your miles at
this time. You can return as often as you want to transfer miles between acc
ounts
看上面那段，应该都可以互转 应该没有什么影响吧.
另外一点，名字必须一样的哦
