New Delhi, Aug. 22 -- The reservation system of India's largest airline IndiGo was restored on Friday, hours after it faced intermittent issues that prevented people from making ticket bookings for a second time this week. IndiGo's website displayed an advisory identical to one it issued on Wednesday, citing "intermittent issues" with its core reservation platform. It was not immediately clear whether the problems were linked to Wednesday's disruption or whether the earlier issue had been fully resolved.P2...