The Thai Customs Department accepts that the number of AEO members (297 AEOs) is not a majority of traders. Nevertheless, taking into account the scope of this study with focusing on automobile parts (heading 87.08) on importation and machinery (Chapter 84) on exportation, certain numbers of AEO companies of Thailand are multinational corporations engaging in substantial Thailand’s trade volume of importation heading 87.08 and exportation of chapter 84. Meanwhile, taking into account the number of AEOs’ member of other Customs Administrations (Japan :552, Singapore: 56, Malaysia :56, South Korea :781), please take note that those leading Customs Administrations have established AEO scheme longer than Thai Customs Department but the AEO number does not reach majority because concept of AEO program is to strengthen the safety net in the logistic supply chain and it will be granted only to the companies complying with the criteria and conditions determined by Customs and be considered as very low-risk traders.