Flight chaos triggered by India’s biggest airline IndiGo in the past few days has raised questions about how an industry came to be dominated by one company, and the risks faced in other key sectors controlled by a few, powerful conglomerates.

IndiGo controls two-thirds of India’s domestic aviation market, operating about 2,200 flights daily. The budget airline failed to prepare in time for new government rules giving pilots more resting time, resulting in a shortage of crew last week. That caused the airline to cancel about 3,000 flights in the span of a few days, impacting half a million travelers, and wiping out billions from the company’s stock value.

Opposition parties, industry experts and economists say IndiGo’s fiasco highlights a deeper problem in the aviation sector about the c

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