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 § 377.10(c) of this chapter (Special Regulations).)