Yep, you need that confirmation number for check-in. If you contact them, they'll re-issue you your e-mail confirmation, but they'll charge you, €10-€15 afair.
Best of luck
I'm pretty sure you need the booking reference number!
Can you call their helpdesk?
If you have your credit card statement its usually on that.
Do you have the flight number and times?? Id just use this when you go to check in. If you still not sure ring aer lingus, although it does take a while to get through to anyone
I lost mine as well but thankfully my sis had saved a copy that I sent her.
If you ring their helpdesk they sould be able to sort you out.
Good luck with it and let us know how you get on.
Do you use outlook? you can recover deleted emails if you do, not sure for how long though.
I've lost that millions of times ring them give your names and the date of flight and they resend them to your email.
I've never been charged
I always get those confirmation emails sent to my hotmail account in case I need to access it away from work. Up until recently I got 'watching' notifications from WOL.....which as you can guess required a massive clear out every so often. I obviously just deleted the Aer Lingus mail at the same time