1. 1Visit aerlingus.com or open the Aer Lingus app.
2. 2Enter your 6-character booking reference and family name.
3. 3Manage your bags and select or confirm your seats.
4. 4Add any Advance Passenger Information (API) if required.
5. 5Save your boarding pass to your device, Apple Wallet, or print it as a PDF.
6. 6If you have checked bags, use a self-service Express Bag Drop Kiosk or check-in desk at the airport.

Booking reference (6-character PNR), valid passport or Irish Passport Card for international travel, and ESTA/Visa for US-bound flights.

Seat selection is available. Saver fare customers are randomly allocated a seat for free during digital check-in and cannot change it later. Standard seats start from €4.99, Extra Legroom from €19.99, and Preferred from €18.99 for European flights. Transatlantic seats range from €44.99 to €74.99.

Advance Passenger Information (API) must be provided at check-in using the travel document you will present at the airport. For transatlantic flights, passport details are mandatory.

Groups of 7 to 25 people can be booked online. However, app check-in is not available for group bookings of 7 or more customers; they must use the website or check in at the airport.

1. 1'Online check in is not available' - Usually means you need to check in at the airport desk for document verification.
2. 2'App won't allow online check in' - The app does not support check-in for group bookings (7+ people); use the website instead.
3. 3'Check in only available for children' - A known glitch; try checking in at the airport.