Online check-in Aer Lingus - https://www.check-in.site

Aer Lingus, like many airlines, typically offers an online check-in service. Here's a general guide for the process:

1. Visit the Aer Lingus official website.

2. Look for an option that says "Check-in" or "Online Check-in". This option is often found in the main navigation menu or within a "Manage Your Booking" or "Passenger Services" section.

3. After you click on this option, you'll usually be asked to enter certain booking details. This typically includes your booking reference or ticket number and your last name.

4. Follow the on-screen instructions to complete the check-in process. This often involves selecting your seat, and you may also be given the option to print your boarding pass or have it sent to you via email.

Please remember that online check-in usually opens 24-48 hours before the scheduled flight departure time and closes a few hours before the flight. Additionally, not all flights may be eligible for online check-in, and the availability of online check-in can vary depending on the departure airport and destination.

However, the actual process can vary and details may have changed since my training data was last updated in September 2021. I would recommend referring to the most recent information provided on the Aer Lingus official website or contacting their customer service for the most accurate and up-to-date information.