The plane finishs takeoff phase to enter the flight condition after booking course to call cruise. Aircraft engine is having different working state, when engine every kilometer uses up the flight rate that least circumstance leaves fuel, call cruise rate. The airlines flies with how old speed, the wear of the security of requirement of the distance that should fly according to the plane, needs time, load, flight, engine and economy, and the of different engine plane with the affirmatory circumstance such as climate condition, height of its cruise speed, cruise and range are different.
