Just an observation, but the Japanese aren’t just going to fly (sacrifice) air to these remote locations like the Solomon’s to stop allied movement. These planes would be sitting ducks for an American or Anz amphib. The US generally has a pretty good supply line going from Hawaii to Queensland, and would love to take out weak Japanese positions along the way, especially if they could pick off a couple fighters w/o ground cover. These air units can’t slow up enemy NCM if the enemy takes them out in the combat phase.
I like the theory of an AB being able to patrol or interfere w/enemy movement in combat or NCM, but not sure it would be worth risking high end units in this way to attempt it. Also IDK if an island w/o an AB should be able to scramble air units, but try this on for size.
Maybe an island w/o an AB can patrol/detect the sz the island is in (one air unit), but an island w/AB can send up to 3 air units total to patrol the sz the island is in, or any adjacent sz. This would allow the Japanese to beef up strong holds like the Caroline Islands to slow up enemy movement in adjacent sz’s. Could establish new strong holds (AB) like in Marshall islands to disrupt movement through sz 30 (Johnson) or new Britten to extend their patrol reach to sz 49 (Solomon). Still keeping the limit of 3 unit scramble in tact. If you scrambled 1 unit to detect in combat phase, you only have 2 more units available to scramble to defend fleet, or do patrol in NCM.
Patrols would probably lead to modifications of battles. Like say the US fleet is in Hawaii sz and is going to attack the Japanese fleet off Caroline Islands (sz 33). The US lays out its path sz30, sz32, then sz33 attack fleet. The Japanese AB on Caroline island could send out 1 fighter to say sz 32 (Marshall sz) to attempt to spot the US fleet (roll detection dice). If detected when the US hits the Japanese fleet off Caroline the all Japanese ships get +1 in the first round because they knew it was coming. BTW the Japanese could now only scramble 2 ftrs to defend the fleet because one ftr was sent on patrol.
I would still hold any AB to the 3 unit scramble, but if it didn’t use up all its scrambling ability in the enemy combat phase, then allow it to disrupt enemy NCM in some way TBD. This would be a major change to the mechanics of the game, so can’t see it adopted into the mainstream game, but would be a cool house rule to test out.
Like Vance said there are many ramifications depending on how far you want to take it. Maybe any operational AB has the ability to patrol its own sz and neighboring sz’s. You don’t actually send out a plane, the AB has one built in patrol craft per enemy turn used during either CM or NCM (just roll detection dice), how it effects enemy TBD.