Hi Paul,
Yes, I indeed began some few years ago to create the heroic flight as an AI traffic. For each stop I did quadruple seaplane Afcad. Then I got as far as Hong Kong.
Here the four Douglas World Cruiser at Sand Point, Seattle
Despite of separate Afcad for each aircraft and the same flightplans, they aren't able to stay grouped together.
Given the extremely long journey, it isn't possible to program this as a continuous AI flight. Therefore, they only complete pattern flights at the various stopovers.
Bernard