[Code of Federal Regulations] [Title 41, Volume 4] [Revised as of July 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 41CFR301-10.180] [Page 32] TITLE 41--PUBLIC CONTRACTS AND PROPERTY MANAGEMENT CHAPTER 301--TEMPORARY DUTY (TDY) TRAVEL ALLOWANCES PART 301-10--TRANSPORTATION EXPENSES--Table of Contents Subpart B--Common Carrier Transportation Sec. 301-10.180 Must I travel by a U.S. flag ship? Yes, when a U.S. flag ship is available unless the necessity of the mission requires the use of a foreign ship. (See 46 U.S.C. App. Sec. 1241.)