I don't see a problem, I assumed he had already gained Advanced Flight from a goody hut on his starting island 
Actually it is possible to build a town on the coast, have a goody hut on an island one tile offshore and pop the hut when the town's cultural border expands.

Actually it is possible to build a town on the coast, have a goody hut on an island one tile offshore and pop the hut when the town's cultural border expands.
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