If an Air AMS participant other than an air carrier requests in-bond authorization electronically through Air AMS, how does it identify the bonded carrier?

If an Air AMS participant other than an air carrier requests in-bond authorization electronically through Air AMS, how does it identify the bonded carrier?

When requesting in-bond authorization in Air AMS, an Air AMS participant must indicate the air carrier code of an onward air carrier or the bonded carrier identification number.  Such identification number must be in one of the following formats (hyphen included):
NN-NNNNNNNAA or NN-NNNNNNNNN (IRS #)
NNN-NN-NNNN (social security number) or
NNNNNN-NNNNN (CBP assigned)