Lounge Kunisaki at Oita Airport sits airside on the domestic 2nd-floor departure waiting area after security. Official materials list roughly 06:40 opening until 15 minutes before the last departure, with ¥1,100 adult / ¥550 child walk-up for two hours and published extension rates. Many Japanese gold/premium cards enter free with same-day boarding confirmation. Priority Pass does not list OIT. The product is a regional waiting room rather than a full-service airline lounge.