easyJet have a huge press & media information kit on their website easyjet.com which has loads of information, past press releases & photographs of easyJet. The airline, in common with many no-frills airlines, do not provide a press kit to send to individuals, preferring to keep their website up to date.
Simon Calder's book "No Frills" is a wonderful reference to not only EasyJet, but other no-frills airlines & how the industry operates. There are also numerous books about Southwest Airlines, often referred to as "The Grandfather of Low-Cost Airlines".