Does this go for Port Strike as well?
Yes, AA seems to have no effect against CVs.
Does this go for Port Strike as well?
For Port Strikes, ground-based FTG and INT will help, if they are based in the same province, and on the airbase when your enemy PS you.
@ Pang: afaik, the enemy PS attack your in-port ships who then use their own individual sea defence to defend themselves.
, but your own FTG/INT fight back, driving the enemy fleet ORG down faster. PS can be painful if unopposed, but having 1-4 INT/FTG defending your port will help protect your ships by lowering the number of PS attacks the enemy can do until their ORG is down. Phew!