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Seven ingredients are used for flavoring, which are steeped in grain spirit for 48 hours,^[7] then re-distilled in a custom-built, 400-gallon pot still. Off the still, Aviation is about 140 U.S. proof, and deionized Cascade mountain (Tap) water brings it down to 84 proof before bottling. Master distiller Christian Krogstad credits natural ingredients and his still’s low reflux for Aviation’s purported bright flavor