 If you liked
Tenkuu no Shiro Laputa
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 ...then you might like
Radiant
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Radiant seems to be inspired by Castle in the Sky if you liked one you should most definitely watch another.
-in both animes there is castle in sky
-action for large part takes place in clouds, winds pose a danger
-main characters are being chased or are jeopardised by some military type guys
-there are one of a kind flying ships
-two young protagonists one male and one female