Leaving on a Jetplane - John Denver
The song has been covered by various artists over the years, but the best known version is probably the one recorded in 1967 by the American folk rock group Peter, Paul, and Mary.
The song expresses the singer's feelings of departure and longing as they tell their loved ones that they are leaving but will come back.
It has become a classic and is often associated with the idea of setting off or departing on a journey, particularly by plane.