[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: 41CFR301-70.806] [Page 83] TITLE 41--PUBLIC CONTRACTS AND PROPERTY MANAGEMENT CHAPTER 301--TEMPORARY DUTY (TDY) TRAVEL ALLOWANCES PART 301-70_INTERNAL POLICY AND PROCEDURE REQUIREMENTS--Table of Contents Subpart I_Policies and Procedures for Agencies That Authorize Travel on Government Aircraft Sec. 301-70.806 What documentation must we retain for travel on Government aircraft? You must retain all travel authorizations and cost-comparisons for travel on Government aircraft for two years.