<div>India's biggest airline, IndiGo, is likely to file the prospectus for a stock market listing that will raise around $400 million later on Tuesday, two banking sources with knowledge of the matter said.</div><div> </div><div>The initial public offering will include about $200 million of fresh equity infusion, the sources said, declining to be named because they were not authorised to speak to the media.</div><div> </div><div>IndiGo, owned by hospitality and travel company InterGlobe Enterprises, is India's largest airline by market share.</div><div> </div><div>A spokesperson for the carrier was not immediately available for comment.</div>