Luckenbach Steamship Co. v. United States

Background

An American steamship company carried United States mail between U.S. ports and ports in the Panama Canal Zone from December 1, 1925, to June 30, 1926. The Postmaster General approved payment on the basis that those Canal Zone ports were "foreign ports" under Section 4009, but the General Accounting Office paid a smaller sum. The carrier sued for the unpaid balance of $30,370.94 after the Court of Claims ruled against it and the company appealed to this Court.

Reasoning

The key question was whether the Canal Zone ports counted as foreign ports for the special mail-compensation rule in Section 4009. The Court looked to a long record of statutes and agency practice — including early treaties, congressional acts (1905, 1912, 1916), Attorney General and departmental opinions, continuous Post Office practice, and a 1926 Act that reenacted and clarified Section 4009 — and applied the rule that longstanding executive construction of an ambiguous statute should be followed. Because executive practice had consistently treated Canal Zone ports as foreign for mail payments, and Congress later clarified the law, the Court concluded the carrier was entitled to the higher compensation.

Real world impact

The decision reverses the Court of Claims and awards the carrier the $30,370.94 balance. It enforces prior Post Office payment practice for mail to the Canal Zone and requires the Government to pay under the foreign-port rate for the period in dispute. The ruling also shows that long-standing administrative practice can control how ambiguous payment rules are applied in government contracts.