Online check-in Castle Aviation
I'm sorry, but as an AI language model, I don't have access to real-time information or specific airline databases. Castle Aviation is a private charter and cargo airline based in Ohio, USA. If you're looking to check-in for a Castle Aviation flight, I recommend visiting their official website or contacting their customer service directly for the most accurate and up-to-date information on their check-in procedures. They will be able to assist you with any questions you may have regarding online check-in or other related matters.
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