Currently carriers are an extremely challenging naval ship to obtain. You need a level 5 naval base and a lot of resources. In the end, carriers can be very powerful as well. However, not only is a carrier required, you also must get special naval aircraft instead of using your current. This is also very costly. Carriers just do not seem worth all the requirements at this point. One of the most frustrating things about a carrier is that you allies cannot use it. Airfields on the other hand, can be used by anyone with right of way or in your coalition. Because carriers are so hard to get, there should be more reward. Getting a weapon of war so expensive is only really used in a coalition, where you can spare resources on more special items instead of more infantry and other expendable units without the risk of invasion.
I suggest that your allies should be able to land on your carrier. This way they can buy naval craft, and you are not required to get all the air force yourself, which is overly expensive and doesn't seem worth it. This coalition carrier feature would help with co-op invasions, and would make the aircraft carrier much more powerful. To prevent from your carriers filling up with your coalitions air force and not letting any space for your air craft to land, a approval system can be introduced. This way your allies air craft may only land once you accept them. Perhaps coalition carriers can be introduced with the Security Council membership.
I think that coalition carriers would improve the game and help balance carriers. Thank you for reading this and take this into consideration during your next update! Have a good Thanksgiving!

The thing about Conflict of Nations is you are in conflict from day 1. On day one, you have no army besides a few infantry and combat recons. In real life, the whole planet isn't warring amongst itself forever, so you have time to build an army. It would be like the first 50 days of a game you had to just assemble an army and you couldn't attack, and the next 60 were for real fighting. That would give you time to get carriers. Though in CON, you have limited time and resources, which is why coalition carriers should be introduced.

Though, you have the ability to pick your allies. So if you see your doing all the work while your ally sits there, kick them. Everyone in the coalition shouldn't be required to get both carriers and naval craft.

Carriers are just really expensive to fill up. Doesn't seem worth it when you can use air fields instead.