请问尊敬的8老师，是不是除了填写Customs Declaration Form，还得填写FinCEN 105？
-Yes.
这个FinCEN 105也是在飞机上填写的？
-Yes if your parents want to, or you can fill this form and the US Customs Declaration Form online for your parents, and print them out, then send the completed forms to your parents. Then, your parents can sign them and just provide them to the CBP officer at the port of entry.
Here is the link for FinsCEN 105:
https://www.fincen.gov/forms/files/fin105_cmir.pdf
Here is the link for Customs Delcaration Form (Open the fillable form on the up right corner to fill it):
http://www.cbp.gov/document/forms/form-6059b-customs-declaration-english-fillable
是不是把FinCEN 105跟Customs Declaration Form一起交给空中服务员？
-No. Proivde these forms to the CBP officer at the port of entry.
