Current and near future carrier operators including amphibious assault ships:
China, India, Italy, Spain, Australia, UK, France, Russia, US, Thailand, Korea, Japan.
Countries that don't need carriers
Thailand. They have little use of theirs and the roles assigned to it could be done better by other units.
Korea. Nothing but a show of force and arrogance to its neighbors. nice design, but little use in Korea's strategic objectives.
India. Its enemy is right next door and most of its foreign interests are next to it too.
Spain. Why do they even need an amphibious assault ship. They rarely participate in wars with the US.
Countries that need carriers:
China. China is the next super power. it has lots of business and strategic interests abroad and it needs to defend them.
Indonesia. An island nation like this needs some kind of carrier and a better navy
Canada. New potential for war over the Arctic Sea, Canada needs something better to project its force.