Migrate Your AWS Site-to-Site VPN Connections from a Virtual Private Gateway to an AWS Transit Gateway

We are excited to announce AWS Site-to-Site Virtual Private Network (VPN) connections can now be moved from a virtual private gateway to an AWS Transit Gateway without having to make any changes on your customer gateway. Transit Gateways enable you to easily scale connectivity across thousands of Amazon Virtual Private Clouds (Amazon VPCs), AWS accounts, and on-premises networks. 
Quelle: aws.amazon.com