The Indian aviation regulator, directorate general of civil aviation, on Tuesday released the latest domestic air traffic data. The data enlists the most punctual airline, growth in country's air travellers, the airline with most complaints and much more.

Here are 10 things you must know about the data.

Passenger Growth

India's domestic air passenger traffic in May rose 2.9 percent year-on-year to 122 lakh passengers. This is the third lowest figure for the calendar year but if compared with data since March, it shows gradual improvement. In March, the passenger traffic grew at 0.1 percent year-on-year, while in April, the domestic air passenger traffic fell by 4.5 percent year-on-year, registering a six-year low.

Market Share

IndiGo remains the largest airline with a market share of 49 percent. SpiceJet attained its highest-ever market share of 14.8 percent, a sharp jump from its April figure of 13.1 percent, in sync with the rapid expansion of fleet undertaken by the airline. The airline added one plane every day for three weeks of May and now has over 100 aircraft in its fleet. Air India occupied 13.5 percent domestic market share. For GoAir, it was again a record figure of 11.1 percent, its highest ever share. AirAsia remained the fourth largest with 6.3 percent share, followed by its sister company Vistara at 4.7 percent share.

Passenger Load Factor

Passenger load factor is the capacity utilisation of an airline or how empty or full the flights were for a carrier. In May, SpiceJet registered the highest load factor for the 50th month in a row at 93.9 percent, followed by GoAir at 93.3 percent. IndiGo's capacity utilisation stood at 90.9 percent for the month of May.

Punctuality

GoAir has remained punctual for nine months in a row. In May, it was the most punctual airline with on-time performance in 91.8 percent of its flights across four metro airports of Bengaluru, Delhi, Mumbai and Hyderabad. It was followed by AirAsia with 89.1 percent punctuality. IndiGo took the third spot with an on-time performance rate of 87.4 percent. SpiceJet was on-time in 74.7 percent of its flights while Air India was the least punctual airline at the on-time performance of 70.3 percent.

Cancellations and Complaints

Most cancellations were registered against Air Deccan with 9.38 percent of its flights being cancelled. This was followed by Pawan Hans at 6.8 percent. Among large carriers, IndiGo's cancellation rate was highest at 0.95 percent, while the lowest was that of GoAir at 0.3 percent. Weather accounted for almost 73 percent of these cancellations.

A total of 746 complaints were registered during the month. Air India topped the list with 1.7 complaints per 10,000 passengers, followed by SpiceJet at 0.6 complaints per 10,000 passengers. Most complaints, to the tune of 35 percent, were related to customer service issues.