Written by John Denver in 1966 and first recorded as Babe I Hate to Go, Leaving on a Jet Plane became a number one hit for Peter, Paul and Mary in 1969. Denver's own version later appeared on his debut album Rhymes and Reasons and became the version most listeners associate with him. The song endured through covers, films and travel culture, and online it is now shorthand for any reluctant departure. Its simple chorus and plainspoken regret keep it instantly recognisable across generations of listeners and creators today.