Online check-in Coastal Air Transport - https://www.check-in.site

I'm sorry, but as an AI language model, I don't have access to real-time information or the ability to perform specific actions such as online check-ins for airlines. Additionally, Coastal Air Transport is not a well-known or widely recognized airline as of my last knowledge update in September 2021.

To check-in for a flight with an airline, I recommend visiting the official website of the airline you're flying with. Most airlines offer online check-in services through their websites or mobile apps. Alternatively, you can contact Coastal Air Transport directly through their customer service channels to inquire about their check-in procedures.

If you're looking for information about a different airline or have any other questions, feel free to ask!