[jonathan]

It's likely they would partner with someone to organise it. So if you look at Virgin here for flights to Barbados you have to have a negative test from one of two companies:

flywith.virginatlantic/g...9-testing.html

On our last Disney cruise it was around 90% Americans but that still meant 300 international passengers to deal with and of course they also cruise in Europe so I'm sure they will cover it.

If you have not booked it may make sense to take a cruise later in the holiday to help with this.

Jonathan