NEW DELHI: Domestic air passengers during the month of April grew by 15.15 per cent with Indian carriers carrying 9.1 million, shows passenger data shared by the Directorate General of Civil Aviation (DGCA).The domestic passenger growth during the first four months of 2017 over 2016 is in the range of 17.7 per cent.The month saw various national carriers in the country register lower load factors. SpiceJet flew its planes with 93.4 per cent of its seats full, which was highest in the country. Air Asia followed SpiceJet closely by flying its planes with 90.1 per cent seats full. IndiGo , India’s largest carrier in terms of market share, flew planes with 86.9 per cent of its seats full.India's passenger growth, which was highest in the world till a couple of months back, has slowed down to under 20 per cent.Travel analysts say that the growth is driven by a mix of business as well as leisure travellers. “The April DGCA report shows a strong growth momentum during Jan-April 2017 period. The growth on a much higher base reflects the buoyancy in the aviation sector and is driven by a mix of increased business as well as leisure travel. The airlines have responded to this by increasing number of flights to existing sectors, expanding to new routes and offering lower fares to tap into advance bookings for the summer vacations,” said Sharat Dhall, COO (B2C) at Yatra.com, an online portal.Vistara topped the list under the on-time performance category by operating about 87.4 per cent of its flights in time. Spicejet came second by operating 85.4 per cent of its flights on time followed closely by IndiGo, which operated 85.2 per cent of its flights in time.IndiGo remained the market leader in terms of passenger carriage by flying 41.1 per cent of the total passengers during the month. Jet Airways followed IndiGo in terms of market share by flying 17.6 per cent of the total passengers flown during the month. Air India and SpiceJet flew an equal number of passengers and clocked a market share of 12.9 per cent each.