5 U.S.C. § 5731 - U.S. Code - Unannotated Title 5. Government Organization and Employees § 5731. Expenses limited to lowest first-class rate

(a) The allowance for actual expenses for transportation may not exceed the lowest first-class rate by the transportation facility used unless it is certified, in accordance with regulations prescribed under section 5738 of this title, that--

(b) Instead of the maximum fixed by subsection (a) of this section, the allowance to an employee of the Government for actual expenses for transportation on an inter-island steamship in Hawaii may not exceed the rate for accommodations on the steamship that is equivalent as nearly as possible to the rate for the lowest first-class accommodations on trans-pacific steamships.