I'm trying to flesh out the military capabilities of my universe and just started to move into defining sea power.
When defining the air power I created a few things, the important ones for the question are the Cruiser and Frigate air ships, and slightly less important are the smaller ships(Fighter, Bomber, Shuttle, Fighter/Bomber). When I made these I was mostly considering air-air and air-land combat, but now that I'm considering sea powers, I think these air ships essentially make surface warships unnecessary.
The Frigate is a flying extruded metal T with a bunch of guns all over it. It is significantly faster than the Cruiser, but is still outpaced by any of the smaller ships. It shoots a lot, can take a decent amount of punches, and is useful for getting around the sides of large enemy craft.
The collection of smaller ships are used mainly to get rid of enemy fighters, support/drop ground troops/vehicles, or in odd occasions, bomb someplace a Cruiser can't hit with the big guns.
Cruisers are big things. Essentially a SHIELD heli carrier with extra guns and an extra big gun. They take hits, hit back harder, and launch the smaller ships. In combat they take out large enemy ships, ground emplacements, or whatever needs that extra boom-power.
All of these ships are able to warp in and out of combat for surprise attacks or quick retreat, but cannot warp to different places on the battlefield. I tried making a reason for this and have basically settled on handwaving. They all also have some basic detection equipment, so if a submarine is nearby they can usually see it, and destroying it can be easily done with a depth charge the extra boom-power from a cruiser.
Yes, a Carrier ship does exist, but it is only used for transporting damaged small ships after combat is over or significantly reduced. They are pretty much giant slabs of burnt toast. They look big and ugly and if you punch them with a missile they fall apart.
I'm fairly certain that if a group of these air ships went up against some sea ships with similar capabilities, it would be a bad day for the sea ships. I also don't see any advantage to having sea ships when you have these air ships other than just in case and backups. I do plan on having submarines though, mainly for stealth operations.
Is there a reason to have surface warships when you have this air force?