Aviation Boatswain's Mate (Equipment) Airman William Buck, from Virginia Beach, Va., repairs a barrel nut on catapult four on the flight deck aboard the aircraft carrier USS John C. Stennis (CVN 74).

Aircraft carriers are warships that act as airbases for carrier-based aircraft. In the United States Navy, these consist of ships commissioned with hull classification symbols CV (aircraft carrier), CVA (attack aircraft carrier), CVB (large aircraft carrier), CVL (light aircraft carrier), CVN (aircraft carrier (nuclear propulsion) and CVAN (attack aircraft carrier (nuclear propulsion). The first aircraft carrier commissioned into the United States Navy was USS Langley (CV-1) on 20 March 1922.