Suggested rule of thumb: Never start a quiz question with the word "Where".
"At Ronaldsway" would be a perfectly acceptable answer to this question, as it stands. Ronaldsway, according to Wiipedia, is "a place in the parish of Malew in the south of the Isle of Man, between the village of Ballasalla and the town of Castletown."
If you want to ask this question, I think you have to give away the fact that it's on an island: "Which island is served by Ronaldsway Airport?" The only real alternative that I can think of is "Which Crown Dependency is served by Ronaldsway Airport?" - which is possibly even more of a giveaway.
If you don't like either of these alternatives ... maybe you just have to ask a different question.
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