My IHUB post #71378 under the alias BulleatsBear:
Post# of 22940
http://www.boeingsuppliers.com/esd/getstart.html
Key takeaway. Becoming a Boeing supplier is a PROCESS. TPAC has completed the PROCESS and become a Boeing supplier.
You cannot "just sign up" You have to APPLY and be APPROVED. Which requires CERTIFICATIONS.
It is a long PROCESS which TPAC has taken the time and energy to COMPLETE.
Always do your own original research. Never take advice from someone who hides behind an alias (including me).