A wave of flight cancellations by IndiGo, India’s largest airline, sparked a week of chaos and grounded tens of thousands of passengers, laying bare the risks of having a duopoly-like situation in the world’s fastest-growing aviation market.For years, IndiGo with a 65 per cent domestic market share has helped Indians realise their dreams of flying -- an aspiration shared by Prime Minister Narendra Modi who once said those “in slippers should also be seen in aircraft”.The airline became the poster child of t ...