41 C.F.R. § 301-2.5 What travel arrangements require specific authorization or prior approval?
Title 41 - Public Contracts and Property Management
You must have a specific authorization or prior approval for: (a) Use of first-class or business-class service on common carrier transportation; (b) Use of a foreign air carrier; (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; (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; and (o) Travel expenses related to attendance at a conference. 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]
Title 41: Public Contracts and Property Management
PART 301–2—GENERAL RULES
§ 301-2.5 What travel arrangements require specific authorization or prior approval?