Online check-in Denim Air - https://www.check-in.site

I'm sorry, but as of my knowledge cutoff in September 2021, there is no information available about an airline called "Denim Air." It's possible that Denim Air is a small or regional airline that may not be widely recognized or might have been established after my knowledge cutoff.

To check-in for a flight with any airline, including Denim Air if it exists, you would typically follow these steps:

1. Visit the airline's official website.

2. Look for the "Online Check-in" or "Manage Booking" section on their website.

3. Enter your booking reference or reservation number and your last name as provided during the booking process.

4. Follow the instructions on the website to select your seat, provide any necessary passenger information, and complete the check-in process.

5. Once you have successfully checked in online, you will usually be able to download or receive your boarding pass electronically. Some airlines allow you to save it on your mobile device, while others may require printing a physical copy.

If you're unable to find information about Denim Air online or if you have any specific inquiries, I recommend contacting the airline directly or visiting their official website for the most accurate and up-to-date information.