[Code of Federal Regulations] [Title 14, Volume 2] [Revised as of January 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR121.91] [Page 738] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) PART 121_OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS-- Subpart E_Approval of Routes: Domestic and Flag Operations Sec. 121.91 Applicability. Source: Docket No. 6258, 29 FR 19194, Dec. 31, 1964, unless otherwise noted. This subpart prescribes rules for obtaining approval of routes by certificate holders conducting domestic or flag operations. [Doc. No. 28154, 61 FR 2610, Jan. 26, 1996]