@Mino1124:
For the first question you can only scramble Fighers and Tac Bombers. Like you said it’s only for island defense, but you can choose to scramble 0, all, or anywhere in between at your discretion. You can even scramble a plane so that the opponent doesn’t get to bombard with ships even if you have no navy defending said SZ. The fight goes on until the attacker retreats his/her sea units, or until 1 or both sides have nothing they can attack with.
As for question 2, there are territories which border multiple sz’s. Alaska for example borders SZ1 and SZ2. Any allie bordering Alaska if US has an airport there would get the bonus so SZ1 and SZ2, not the SZ’s touchig the SZ’s that touch the land (if that makes any sense). Soviet Far East also borders multiple SZ’s. It borders SZ3, SZ4, and SZ5.
I would not agree on scrambling into a SZ where no naval battle occurs - the rulebook states the premise “naval battle”.
But another question:
Scramble states island with airbase.
Japan is an island, so OK you can scramble from there.
Australia is NOT an island (its a continent ;)) - so if I do rules lawyering I would say planes can NOT scramble from any territory in Australa (US/ASIA) to join a naval battle - correct?
If yes - is it intentional or just an oversight…?