Under Mills, SpiceJet has also stepped into uncharted territory.
For instance, importing aviation turbine fuel directly or deciding to fly to Kabul.
The decision to fly to Kabul is, however, a gamble, as the Afghan capital is neither a market for leisure, nor one of corporate travel.
In the domestic sector, too, SpiceJet has been forced to withdraw certain flights and shut stations like Nanded in Maharashtra because of poor traffic.
Mills, however, seems confident about the Kabul sector.
The route would benefit Afghan traders and enable medical tourists from that country to visit India.
"Instead of flying to the Gulf, they can fly to Delhi, which is closer," he says.
Image: This picture taken in Kabul on September 18, 2011 shows passengers arriving at the Kabul International airport.