Online check-in Donghai Airlines - https://www.check-in.site

To perform an online check-in with Donghai Airlines, you'll need to visit their official website or use their mobile app if available. Since my knowledge was last updated in September 2021, I'm unable to provide you with the most up-to-date information on Donghai Airlines' specific online check-in procedures or any recent changes they may have implemented. Therefore, I recommend visiting Donghai Airlines' website or contacting their customer service directly for the most accurate and current instructions on how to check-in online. Their website should have a dedicated section for online check-in where you can enter your booking details, select your seats, and obtain your boarding pass.