@Afrika:
. . .
A navy can attack a province before they are in range of fighters. Fighters attack 2 squares away but have to be in the sea zone they are attacking, whereas navies move two and land in the coastal area without using an additional move.
That is correct, and I was wrong! What we lerned from this is that it is not just time consuming to build a navy and move across the oceans, a navy is also costinefficient compared to a flotilla of fighters. But as you said, a navy can attack (amphibious assault) a land territory before the ftr are in range of fighters. But that does not matter if the navy cannot conduct shore bombardment. And remember that defending fighters are even harder to crack. My suggestion is that all destroyers should be able to make a support shot on amphibious assaults on a 2. Get rid of the technology Combined Bombardment and replace it with Heavy Artillery (art attack on 3). Moreover the optional unit, cruisers, would make it even more balanced.
Cruisers
Description: Multipurpose ships that can fire on incoming enemy planes and conduct shore bombardment.
(One can use the battleships from A&A Classic as cruisers.)
Cost: 15
Attack: 3
Defense: 3 (Opening fire against attacking aircraft)
Move: 2
Special Abilities
Shoot Down Air Units: Whenever an air unit enters a sea zone containing an enemy cruiser, the cruiser fires during the Conduct Opening Fire step of combat. Roll one die for each attacking air unit (but only one cruiser in a sea zone can fire during the opening fire step, even if they are controlled by different powers). For every roll of 1, one attacking air unit is destroyed. This opening fire capability is for the first cycle of combat only and does not cancel the regular roll during the Defending Units Fire step.
Shore Bombardment: In an amphibious assault, your cruisers may like battleships make a support shot on amphibious assaults on a 2. Each cruiser fires once during the Conduct Opening Fire step against enemy land units in the territory being attacked (the enemy units do not fire back). A cruiser cannot conduct shore bombardment if it was involved in a sea combat prior the amphibious assault.