Q. Which routing number should I input when I transfer to US?

You should input the ACH Routing Number (Electronic Routing number) for the Routing number.

Routing Number is the 9 digits unique number the bank uses in the US and ACH Routing Number and ABA Routing number is usually same.

In case of BOA (Bank of America), ACH Routing Number and ABA Routing Number can be different depends on the branches, please make sure to input the ACH Routing Number.
If you input the ABA Routing Number or Wire Routing Number in a case that you want to send a money to BOA, the remittance can be delayed or declined and also the transfer fee may not be returned.