99% sure open communication is allowed. The extent to which it’s allowed is up to you, though. With my play-group we cut it off at “talk of general strategy is allowed, anything more specific is not.” We do it this way because of bad experiences where multi-player games would devolve into the “good” Axis Player and the “good” Allies Player forcing their teammates to obey their orders on what to do each turn, effectively turning the game into a 1v1 with a peanut gallery. That’s not much fun for anyone.
air unit rules
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Can I do an amphibious assault on an island with only aircraft?
And can those aircraft also attack the sea zone surrounding the island? -
- This question is rather ambiguous. If you’re attacking with aircraft only (no land units), it’s not an amphibious assault. If you mean, “Can I conduct an amphibious assault without cruisers or battleships for shore bombardment?”, the answer is yes, you can.
- When conducting an amphibious assault, you have to choose which aircraft will participate in any naval battle and which will participate in the land combat; they cannot do both. Any naval battle must be resolved before amphibious landings can take place.