But experts warn cheap tickets and an over-reliance on favourable fuel pricing is unsustainable. India's top two airlines by market share, IndiGo and Jet Airways, and debt-laden state carrier Air India are all suffering financial woes, while SpiceJet's boss has said the industry is in "great stress". "The rise in the price of Brent fuel, a depreciating rupee and a resulting mismatch between high fuel prices and low fares have adversely impacted the Indian aviation industry, including Jet Airways," Jet CEO Vinay Dube said this week. Brent crude has risen 50 percent a over the past year, while the impact has been exacerbated by the rupee recently touching a record low of 70 to the dollar. Then they must pay taxes of up to 44 percent on jet fuel, the highest in Asia according to Bloomberg News, all the while stumping up billions for new planes to keep up with passenger demand.