The carriers are very very important in that they allow us to gain air superiority.
The larger ones have as many as 100 + aircraft. Other smaller ones used for helicopters w/ Marines for landing inside hostile areas.
Each carrier is also usually escorted by at least 2 nuke subs or more.
Then you have command and control ships for the aircraft missions and defense etc along with other support and protective ships.
Seen one of those pictures with one carrier and many ships with it before?
Thats them.
Stennis=Planes: approx. 85
Aircraft carried: 90 fixed wing and helicopters