The plan then creates one TGW per region, and sets up TGW peering. One route table is created per TGW with propagation enabled. the remote VPC points to the local (west) TGW for 10.0.0.0/8; the 'hub' ...

This project contains diagrams to help you understand AWS Transit Gateway (TGW) routing. Like example 5, the destination VPC does not have a TGW attachment in the same AZ as the source (AZ-A). However ...