Numbers vary slightly year to year, but international travelers make around 8-10% of leisure-related tourism according to Visit Orlando.
Obviously, this doesn't mean the parks reflect the same data... but it's probably close.
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Waiting on the 2024 numbers to be released, but we did see a decline in domestic tourism between 2022 and 2023, with international travelers picking up the slack... so I don't think international tourism is entirely to blame either.
MCO Passenger Volume increased 2.3% last year, so probably a similar story to 2023 visitation wise.