For those that are interested, there is a comparison of Aer Lingus, Easyjet and Ryanair cost per pax on slide 13 of Ryanair's latest offer presentation:
http://www.ryanair.com/site/promos/c...esentation.pdf
Whether you choose to believe it or dismiss it as spin is up to you. You could also argue that they are not really comparing like with like. Nevertheless, it makes for interesting reading.