[Code of Federal Regulations] [Title 14, Volume 4] [Revised as of January 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR399.18] [Page 469] TITLE 14--AERONAUTICS AND SPACE CHAPTER II--OFFICE OF THE SECRETARY, DEPARTMENT OF TRANSPORTATION (AVIATION PROCEEDINGS) PART 399_STATEMENTS OF GENERAL POLICY--Table of Contents Subpart B_Policies Relating to Operating Authority Sec. 399.18 Maximum duration of fixed-term route authorization granted by exemption; renewal of such authority. It is the policy of the Board to limit the duration of exemptions which authorize fixed-term route service to a maximum period of two years, and to entertain requests for renewal of such authority only when incorporated in a duly filed application for substantially equivalent certificate authority under section 401 of the Act. (See Sec. 377.10(c) of this chapter (Special Regulations).) [PS-21, 29 FR 1446, Jan. 29, 1964, as amended at 65 FR 6457, Feb. 9, 2000]