e-mail address
Like most companies who profess "customer service" but then refuse to deliver the most basic form of service, e-mailing, Aer Lingus regretfully are also now on this list.
Unless you know the person and have their address, EI will only accept FAX from its customers, the number is on the web site.
Ring them and you are talking to someone in "Swindon" who knows f--- all about anything except selling you the highest fare as they work on commission and have no authority to do anything.
Maybe Mr Muller will restore the some of the reputation EI once enjoyed in the world to his customers by talking to them again.