The Airports Authority of India (AAI), which runs 125 airports across the country, would approach the government to allow it to raise 5,000 crore rupees through infrastructure bonds. Speaking to reporters on the sidelines of a function in New Delhi, AAI Chairman V P Agrawal said AAI will approach the government to allow us to issue infrastructure bonds for the next phase of development of 15 airports during the 12th Plan period.Finance Minister Pranab Mukherjee had announced in the 2011-12 general budget that government would allow issuance of tax-free infrastructure bonds worth 30,000 crore rupees by various bodies in the current financial year. Our correspondent reports, the 15 airports which are to be developed in the next phase would be those non-metro airports which can be revived and where there is a big traffic potential that can be developed by the airlines over a few years. He said, Indian aviation sector would require a total investment of about 110 billion US dollar till 2020.