The United States fields the largest modern carrier force in the world and very few nations field more than one example. For the purposes of the GFP ranking, Helicopter Carriers are included in this listing alongside conventional deck carriers due to their growing popularity worldwide. Landlocked nations are not penalized for the lack of a standing naval force but those powers with clear access to oceans are penalized for lacking a carrier force. Aircraft carriers currently under construction (as of 2016) are excluded.
The aircraft carrier remains a nation's "symbol of strength" on the ocean and is a sought-after component of several emerging powers such as China and Turkey. Expensive to maintain and operate, powers that manage to field aircraft carriers are typically limited to a single example or fewer than five - the United States Navy being the one clear exception.
Aircraft Carrier strength data through 2017.
Sources: CIA.gov, CIA World Factbook, wikipedia.com, public domain print and media sources and user contributions. Some values may be estimated when official sources are lacking.