A CV BO can ONLY be used on premium ships and event ships of that respected nation, as well as any ship you choose before that.
Will not be able to use anything on the brooklyn line to make it simple.
Fighters are a good option to have. Always keep in pairs. 4 ft, 2 DB, 2 TB. 2 ft, 4 DB, 4 TB. Even numbers, don't mix 3 Ft, 5 DB, 1 TB because you will have a time when you wanna launch more fighters and you only have 1 SQ left.
Additionally, elite fighters are the way to go for USN. Add in an elite fighter turned seaman and you're on the path to air domination.