The US is amphibious assaulting Korea and can the planes in japan scramble to kill the transports in the seazone. The are no jap ships in the sea zone.
The scrambling fighters will defend the seazone, not the territory.
Here’s the situation. The US lauches a successful attack on sz6 and invades Korea. The next turn Japan counter attacks sz6 and clears it of US boats, but Japan also loses all the attacking forces, so the transport survives. Japan then places 2 destryers in sz6. Can the transport load the troops from korea and move to Okinawa and launch an amphibious assualt there, or is the sz6 now considered hostile thus preventing the troops from being loaded?
The sea zone is hostile. The transport must leave the sea zone in combat movement, unless other US units attack the destroyers. In any case, no units may be loaded there.