Flight operations from Mumbai, which has been hit by worst-ever terror attack, largely remained unaffected, except for cancellation of five services by four international airlines.
DGCA report shows IndiGo's continued dominance in market share with 30.7%, followed by SpiceJet at 20.9%.
All Indian carriers flew 60.22 lakh (6.02 million) passengers in May compared to 57.10 lakh (5.71 million) in April, while the January-May figure stood at 267.22 lakh (Rs 2.67 million) as against 260 lakh (2.6 million) in the same period last year recording a 2.78 per cent growth, latest official air traffic data showed.
IndiGo was the only airline to have reported profits during this period, barring 2011-12 when it made a loss of about Rs 88 crore (Rs 880 million.
IndiGo's passenger load factor, at 67% in July, fell six percentage points from the same month last year.
Vistara reported a passenger load factor of 45.4 per cent.