Air India sale will give a boost to India’s privatisation drive, the Economic Survey said on Monday, as it suggested redefining the public sector role in business enterprises to encourage private participation in all sectors. The government earlier this month handed over ownership rights in national carrier Air India to Tata Group for Rs 18,000 crore. The amount includes the takeover of the debt burden of Rs 15,300 crore and another Rs 2,700 crore in cash.