With the cost of aviation turbine fuel escalating sharply, India's domestic airlines are lurching from one crisis to another. Hardly a week passes without one airline or another marking up its fares or reporting heavy losses. Already, some of them have pruned the number of their flights and have hinted at further rationalisation, which invariably means scaling down. Those are steps in the right direction but are too few and probably too late from the standpoint of th e industry's health. What is at issue is the business model adopted by the new low-cost carriers (LCC), whose era began with Air Deccan in 2003.With the overriding objective of grabbing market share at all costs, the airlines