(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—

(1) lowest first-class accommodations are not available; or

(2) use of a compartment or other accommodation authorized or approved by the head of the agency concerned or his designee is required for security purposes.

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(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.