Section 19(3)(d) in Airports Authority of India (Management of Airports) Regulations, 2003
(d)Notwithstanding anything contained in these regulations, the Competent Authority may, if he is satisfied that it is necessary or expedient to do so for the maintenance of proper order or decorum, refuse admission to any person into the terminal building or any part of such building or require any person in such building or part, to leave the same.