Section 5(9) in The Airports Authority of India (Major Airports) Development Fees Rules, 2011
(9)If at any stage, it is found that the development fees has not been utilised by the Airport Operator for the specified purpose (as per the report of the independent auditor or independent engineer), the Airport Operator shall pay penal interest at State Bank of India Base Rate plus ten percent per annum on such amount from the date of its withdrawal.
