How does America gain experience with large carriers?

How would the United States acquire the experience needed to build much larger carriers?

Converting the unfinished Lexington-class USS United States would create an early large-carrier test bed, while otherwise the navy would have to learn through successive smaller classes.

Treaty permission does not substitute for design and operating experience. A large conversion lets the US Navy test hangars, lifts, machinery, air-group handling, and fast-force operations on a hull already available. Lessons from that ship can feed the first purpose-built generation under the larger allowance. If the conversion does not occur, the navy still develops carriers, but the path toward an Essex-scale design becomes slower and more incremental.