The commission may make such just and reasonable classifications for brokers and air carriers, according to geographical sections, types or otherwise, as it may determine to be in the public interest, and may make any provision of this chapter inapplicable to any or all brokers or air carriers or classes thereof for such periods or until such time and subject to such terms and conditions, as it may deem to be in the public interest. Such action shall be taken with the objective of so adjusting the regulatory provisions hereof to the changing conditions of the brokerage and air carrier business as to avoid undue administrative burdens.