平信：從上海寄送到美國大約需要15天左右。
價格最低。如果你擁有打折郵票，只需成本10元左右便可以寄送航空郵件。
平信：安全性不錯，可以寄送到任何地址，包括大多數國際快遞不寄送的PO. BOX地址。
寄送后您可以發信查詢
E-mail Sample
Dear Officers:My supporting material has been sent to you by FedEx. I want toconfirm whether you have received the material and if anything is missing, please let me know. Thank your for your help during this busy season.Last Name: First Name: Tracking Number:I have finished my onlineapplication with ID **********