The angled flight deck was first tested on
HMS Triumph by painting angled deck markings onto the centerline of the flight deck for touch and go landings.This was also tested on
USS Midway the same year.Despite the new markings, in both cases the arresting gear and barriers were still aligned with the centerline of the original deck. From September to December 1952,
USS Antietam had a rudimentary
sponson installed for true angled deck tests, allowing for full arrested landings, which proved during trials to be superior. In 1953,
Antietamtrained with both U.S. and British naval units, proving the worth of the angled deck concept.
HMS Centaur was modified with overhanging angled flight deck in 1954. The U.S. Navy installed the decks as part of the
SCB-125 upgrade for the
Essex class and SCB-110/110A for the
Midway class. In February 1955,
HMS Ark Royal became the first carrier to be constructed and launched with an angled deck, rather than having one retrofitted. This was followed in the same year by the
lead ships of the British
Majestic class (
HMAS Melbourne) and the American
Forrestal class (
USS Forrestal).