Chapter 2$_{ }$ En Route Operations  Introduction  The en route phase of flight is defined as that segment of  flight from the termination point of a departure procedure  to the origination point of an arrival procedure. The  procedures employed in the en route phase of flight are  governed by a set of specific flight standards established  by 14 CFR [Figure 2-1], FAA Order 8260.3, and related  publications. These standards establish courses to be flown,  obstacle clearance criteria, minimum altitudes, navigation  performance, and communications requirements. 