Notwithstanding the provisions of § 216.3, if within 30 days after the effective date of this part a carrier files an application for a Special Authorization to continue to perform existing blind sector operations which have been regularly performed by such carrier commencing on a date prior to August 9, 1967, such carrier may continue to engage in such blind sector operations until final decision by the Department on such application: Provided, That any such application shall, in addition to the requirements of § 216.4(a), contain a statement that the carrier is relying upon this section for continuance of preexisting blind sector operations, and shall fully describe such operations including the date inaugurated, and the frequency and continuity of performance.