What travel arrangements require specific authorization or prior approval?

§ 301-2.5 What travel arrangements require specific authorization or prior approval? You must have a specific authorization or prior approval for: (a) Use of other than coach-class service on common carrier transportation; (b) Use of a foreign air carrier or foreign ship; (c) Use of reduced fares for group or charter arrangements; (d) Use of cash to pay for common carrier transportation; (e) Use of extra-fare train service; (f) Travel by ship; (g) Use of a rental car; (h) Use of a Government aircraft; (i) Payment of a reduced per diem rate; (j) Payment of actual expense, unless your agency has issued a blanket actual expense authorization under § 301-70.201; (k) Travel expenses related to emergency travel; (l) Transportation expenses related to threatened law enforcement/investigative employees and members of their families; (m) Travel expenses related to travel to a foreign area; (n) Acceptance of payment from a non-Federal source for travel expenses, see chapter 304 of this subtitle; (o) Travel expenses related to attendance at a conference; and (p) Due to an employee's medical requirements or religious beliefs, payment of the full M&IE allowance even though meals are furnished by the Government either directly or through a registration fee or other payment for a conference or other event, in accordance with § 301-11.18(b). Note to § 301-2.5: Paragraphs (c), (i), (n), and (o) of this section require a written or electronic advance authorization. [FTR Amdt. 70, 63 FR 15955, Apr. 1, 1998, as amended by FTR Amdt. 2005-03, 70 FR 28459, May 18, 2005; FTR Amdt. 2009-03, 74 FR 16328, Apr. 10, 2009; FTR Amdt. 2009-06, 74 FR 55147, Oct. 27, 2009; FTR Amdt. 2011-03, 76 FR 55274, Sept. 7, 2011; FTR Case 2020-300-1, 87 FR 55702, Sept. 12, 2022]