InterGlobe Aviation promoter Rakesh Gangwal and his family trust on Tuesday sold a 5.7 per cent stake in the airline for about Rs 11,385 crore (USD 1.33 billion) through a block deal, according to sources. Apart from Gangwal, the Chinkerpoo Family Trust, whose trustees are Shobha Gangwal and JP Morgan Trust Company of Delaware, has also participated in the transaction for divesting its stake in IndiGo, the country's largest airline, the sources said. Investment banking firms Goldman Sachs (India) Securities Pvt Ltd, Morgan Stanley India Company and J P Morgan India are the placement agents for the stake sale, they added. Before the latest transaction, Gangwal and the family trust together owned about 13.5 per cent in IndiGo. As per the latest block deal, up to 2.2 crore equity shares were sold at a floor price of Rs 5,175 per share, as per the updated term sheet seen by PTI. The total number of shares has been raised from the initial 13.2 million shares (1.32 crore shares) worth .