Additional compensation for extension of route or additional service

§ 6424. Additional compensation for extension of route or additional service (a) The Postmaster General, in cases where the mail service would be improved, may obtain additional service or extend routes under contract. Extensions ordered during a contract term may not, in the aggregate, increase the one-way length of a route more than fifty miles. (b) The Postmaster General may not allow additional compensation under this section at a rate proportionately greater than the rate established by the contract involved. (c) When additional service is ordered, the Postmaster General shall state the sum allowed therefor in the order, and enter it in the records of the Department. He may not pay compensation for additional regular service rendered before he issues the order. (d) Subsection (c) of this section does not apply to service authorized under sections 6415, and 6422 of this title.