Ryanair

Ryanair web site
Phone number (from UK): 09062 70 5656 (Calls charged at 25p/minute)
Ryanair is based in Dublin, Irish Republic
Ryanair route map
Ryanair on Wikipedia
Passenger reports and opinions about experiences with Ryanair

• Flies 120 Boeing 737's, making it one quarter the size of the largest low-cost airline in the world (Southwest in the US, which has 500); Ryanair's fleet is similar in size to Easyjet's and to British Airways' short-haul aircraft fleet, which is used on European routes
  
• Planes are new - on average less than 3 years old
• Ryanair's main hubs have historically been Dublin and London Stansted, but it is now developing more across Europe, including Glasgow (Prestwick), Brussels (Charleroi), Frankfurt (Hahn), Milan (Bergamo), Marseille, Gerona and Rome
• This is the largest low-cost airline in Europe in terms of the number of passengers flown, and is also the most profitable
• Average revenue per passenger is only £30, so typical ticket prices are low by any standards, and 'no-frills' really does mean what it says
  

List of airlines
List of countries (each one linked to a list of its airports)