text: factor 
  the turbojet 
  affecting the specific range of 
  airplane. Any operation below the optimum 
  altitude will have a noticeable effect on the 
  range capability and proper consideration 
  must be given to the loss of range. 
  In addi- 
  tion, turbojet airplanes designed specifically for 
  long range will have a large percent of the 
  gross weight as fuel. The large changes in 
  gross weight during cruise will require partic- 
  ular methods of cruise control to extract the 
  maximum flight range. A variation from the 
  optimum flight path of cruise (constant Mach 
  
  Altitude  is the one most important 