回复：回复：父母延期appoval notice

Here's a list of mine. You'd better check the instructions
in I-539 form.

1. written statement explaining the reasons for the request

2. filled I-539 form

3. filled I-134 form

supporting materials:
- statement from Bank
- job contract, etc

4. copies of all pages of passports

5. copies of I-94 forms

6. copies of Visas

7. application fee of $195

8. return E-tickets

Good luck!