IndiGo, the low-cost carrier and frequency and capacity leader, and Air India, the full-service carrier, were the two ends of the spectrum. Within days, that is changing with Air India assuming the lead on the capacity and frequency front and IndiGo starting dual-class service.

Mount Lewotobi Laki Laki, situated on a remote Indonesian island, erupted earlier this month, creating ash clouds that pose potential hazards for aircraft. Given the unpredictable nature of volcanic ash dispersal,

Air pollution in India's national capital increased to 'severe' on an official index on Wednesday for the first time this season as temperatures and wind speeds dropped, reducing visibility and affecting some flights.