Are these parties required to participate in Air AMS?

Are these parties required to participate in Air AMS?

No. Participation for these parties is voluntary.  These parties may voluntarily participate in Air AMS for the purpose of providing house air waybill level information directly to CBP without having to provide it to the carrier.  If such parties do not voluntarily present the full house air waybill information directly to CBP the incoming air carrier must provide that information.