Multinational scrambling?

No.  Scrambling occurs during the Conduct Combat phase, so all combat movements will have been completed.  Scrambling only occurs in sea zones in which attacking units end their combat movement.

@fanofbond:

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.

You are correct.  My appologies.

I say let planes scramble from any airbases anywhere anytime, even land lock airbases.  The defending player still has to make the same choices of where to use his planes to benefit him the most.  Capping it at 6 would be easy to accept and figure out.  Just so long as you make it 1 plane for 1 point of damage on the airbase, so like 5 damage points on an airbase limits it to 1 airplane that can scramble.  You could make exceptions for airbases on capital cities or even for VCs in general, like unlimited scrambling.

Thanks for the clarification, my friend was trying to argue that we couldn’t bring bombers into the sea zone just in case he wanted to scramble.

Interesting to see how it affects the Atlantic war; I’ve always believed there should be a “killing zone” in mid-ocean which is out of range for land-based aircraft, but will the sea be wide enough?

You guess correctly.  Your transports need an escort when amphibiously assaulting an island with an airbase.

Yup.  Sea battle = no bombardment.