Just wanted to clarify as there are two conflicting answers to this question:
@wilk7011:
Here is the scenerio U.S. want to invade German coastal territory A. The sea zone the U.S. is invading from is touching both territory A and territory B. Territory B has an airbase with fighters on it. Can Germany scramble fighters from territory B even though the attack is on territory A?
@calvinandhobbesliker:
Only planes from A can scramble unless the US is also invading B.(This is for Alpha + 0.1)
@Krieghund:
OOB - Yes.
Alpha+.1 - Only if there is a sea battle before the assault.
Krieghund is right in this case. Here’s the explanation from Larry:
In situations where a sea zone is served by more than one airbase, Korea and Japan into sea zone 6 for example, each of the territories (or both in this case) can scramble up to 3 fighters and/or tactical bombers. On the other hand, if Korea is specifically being attacked by an amphibious force, and there is no sea battle occurring, only the aircraft in Korea can participate in the scramble.
To sum it up: If there is a sea battle, involving an amphibious assault or not, all neighboring aircraft that meet the scramble requirements can participate in the sea battle. If there is only an amphibious assault and there is no sea battle, only the territory be attacked from the sea can scramble up to 3 aircraft.
Explanation from here: http://harrisgamedesign.com/phpBB3/viewtopic.php?f=40&t=4060