Father and son's wealth was propelled by the November listing of their InterGlobe Aviation, which owns IndiGo, India's largest and most profitable airline, with a market share of 40%. Fare wars took a toll on the budget carrier's net profit, which declined 7% to $89 million in a recent quarter. The airline took delivery of its first new Airbus A320neo aircraft in March but may delay further inductions pending an upgrade to their engines. The Bhatias are mulling a public listing of their travel commerce firm InterGlobe Technology Quotient.