Section 2. In section 5 of the Aircraft Act, 1934 (hereinafter referred to as the principal Act), clause (ab) o

2. In section 5 of the Aircraft Act, 1934 (hereinafter referred to as the principal Act), clause (ab) of sub-section (2) shall be re-settled as clause (ac) thereof and before it, as so re-lettered, the following clause shall be inserted, namely:— '(ab) the economic regulation of civil aviation and air transport services, including the approval, disapproval or revision of tariff of operators of air transport services; the officers or authorities who may exercise powers in this behalf; the procedure to be followed and the factors to be taken into account by such officers or authorities; appeals to the Central Government against orders of such officers or authorities and all other matters connected with such tariff. Explanation.—For the purposes of this clause, "tariff" includes fares, rates, valuation charges and other charges for air transport of passengers or goods, the rules, regulations, practices or services affecting such fares, rates, valuation charges and other charges and the rates; terms and conditions of commission payable to passenger or cargo sales agents;'