They have boat hangars, right?(Vehicle)
READ THIS THEN CLICK ON LINK:
Definition of Amphibious: Able to operate both on land and in water. SO ITS A BOAT!
http://www.youtube.com/watch?v=aE0hnDWI_0U
Boat Hangers are called AV's or in another words: seaplane tenders, they were auxilary class ships designed to replenish and maintain seaplanes.
Other Aux ships are: AE - or effective fleet replenishment capability, the idea was to replenish carriers/warships at sea, AKE's were world war 2 designs however it was not until 1945 that AE's were able to replenish while at sea.
AD's were Destroyer tenders, able to replenish Destroyers with everything needed to maintain a squadron
AS were Submarine tenders
AGP were torpedo boat tenders (PT boats)
AKV were transports able to carry Aircraft (normally an AK could carry aircraft, however they had to be crated up, AKV's were able to keep a squadron of aircraft ready to deploy without having them crated (they used cranes)
AR's were Repair ships, if a warship was damaged he could dock with an AR and it would be able to give it some repairs before heading back to drydock, this was major in saving quite a few warships from being sunk, it wouldn't fix major damage (gun turret blown off) but if they needed to patch a hole in the hull, then an AR was useful.
Finally AVP were small seaplane tenders, for single engined seaplanes etc, possibly Pby's I cant remember.
AZ - not sure if any served in WW2 (cant remember) they were lighter then air tenders, for blimps etc. There were some blimps used for submarine spotting off california, however I barely remember reading much about them.