The aviation industry is in trouble. Fuel prices have soared, there’s been a drop in passenger numbers and some airlines have gone out of business, but in Europe there’s one airline which is bucking the trend. The low-cost, no-frills Ryanair carried almost 80 million passengers last year. Michael O’Leary is the pugnacious, outspoken Chief Executive of Ryanair who has ambitions to make his airline even bigger, but how far can he fly before he gets shot down? He talks to Stephen Sackur in Dublin.