Have you checked the equipment Aer Lingus is using for the flights you are needing? I have always been a fan of AL. However, last Sept/Oct flights with them made me rethink using them in the future. There were several problems which I won't detail here. Just be sure to check which AirBus they are flying on your routes. If it is the Air Bus with 'neo' at the end it can be 6 across, 3 on each side of 1 aisle, not the 2 aisle 2 4 2 seating plan. My flight from Dublin to Toronto last year was the 1 aisle type and was completely booked, making for a very uncomfortable flight. Many times it was impossible to get to any of the toilets as the flight attendants were serving and the aisle was blocked for lengthy periods.