Two US Navy (USN) catapult final checkers give the all clear signal before launching a USN F-14 Tomcat aircraft from Fighter Squadron One Four (VF-14) "Tophatters", during flight operations aboard the aircraft carrier USS ENTERPRISE (CVN 65)

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.