India has signalled tough action against its largest domestic airline IndiGo after days of severe flight disruptions that left thousands of passengers stranded. The country's aviation minister told parliament that strict measures are coming, saying IndiGo will be made an example for the rest of the industry. But India's new rules on pilot duty hours may have contributed to the roster chaos behind the wave of cancellations that began late last week, says Matt Driskill, editor of Asian Aviation