[Code of Federal Regulations] [Title 41, Volume 4] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 41CFR301-10.106] [Page 27-28] 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. 301-10.106 What are the basic requirements for using airlines? The requirements for using airlines fall into three categories: (a) Using contract carriers, when available; (b) Using coach class service, unless business-class or first-class service is authorized; (c) Using U.S. flag air carrier or (ship) service, unless use of foreign air carrier or (ship) is authorized. [FTR Amdt. 70, 63 FR 15955, Apr. 1, 1998; 63 FR 35537, June 30, 1998, as amended by FTR Amdt. 2005-03, 70 FR 28460, May 18, 2005] [[Page 28]] Use of Contract City-Pair Fares