The Comptroller and Auditor General (CAG) has unearthed a whopping Rs 1.63 lakh crore scam related to the Delhi airport land deal.According to the CAG report, the government gave 4,799.09 acre of prime land on lease to its private sector partner Delhi International Airport Limited (DIAL) for development of the airport. The land was given on a paltry lease rent of Rs 100 per acre per year for a period of 60 years.Interestingly, DIAL itself has estimated that commercial exploitation of the land for 60 years would give it profit to the tune of Rs 1.63 lakh crore.In its report, the CAG has indicted the Union civil aviation ministry's role in land allocation in a number of places. It clearly states that "the ministry and the AAI (Airports Authority of India) have always ruled in favour of the operators and against the interest of the government".The loot did not stop at highly discounted lease rent. Despite that unfair advantage, DIAL went a step further and got a post-contractual benefit of levying airport development fees of Rs 1,300 extra for international flight and Rs 200 for domestic journey from each passenger.DIAL also mints money from the 5 per cent land it has been allowed to use for commercial exploitation. Hotels, malls etc have been built on this land and DIAL gets a share of their profits.Minister calls it 'draft report'Civil Aviation Minister Ajit Singh played it safe on the damning CAG report. He said it was just a "draft report"."It is a draft report. We will cooperate. Let us not level any allegations. We should wait for the final report," the minister said.