Can a credit card change in terms be sent via 3rd class mail? What is the industry standard class when sending CIT - first class mail or third class mail?

The regulation only mentions when you have to deliver or mail notices. If you are comfortable that it might take 2-4 weeks for Marketing Mail (formally Third Class) to be delivered to your customers, then technically you probably meet the regulatory requirements.

Agree, its all about the timing if you use it. Thank you.