14 CFR 232.5 - Filing and service of applications, answers, and replies.
(a) An application, answer or reply filed hereunder shall be deemed to have been filed on the date on which it is actually received by the Department at its offices in Washington, D.C.
(b) At the time a written or telegraphic application, answer, or reply is filed under this part, a copy thereof shall be served by personal service, registered mail, or telegraph upon the Postmaster General and upon the air carrier operating or ordered to operate the mail service in question. Except in the case of telegraphic delivery each copy so served shall be accompanied by a letter of transmittal stating that such service is being made pursuant to this section. In the case of telegraphic delivery the copy shall be accompanied by a telegraphic statement that service is being made pursuant to this section.
(c) The execution, number of copies, and verification of a written application, answer, or reply filed under this part, and the formal specifications of papers included in such application, answer, or reply shall be in accordance with the requirements of the Rules of Practice relating to applications generally (see part 302 of this chapter).