Yes. They may move through a friendly sea zone that contains an enemy-controlled Convoy Center or Route during noncombat movment, but they may not take control of it when doing so.
One sez-zone question
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When you have an air base on an island, the sea-zone in which it is contained and the island itself are considered to be one.
My question is, if enemy ships move into this territory, is it possible to attack (defend) those ships with the planes on the island since the island and the sez-zone are considered to be the same territory?
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:cry: No
On your turn you can do CAP in that zone instead.