Lyric discussion by pookerella 

Cover art for Just A Song Before I Go lyrics by Crosby, Stills, Nash & Young

This song says EXACTLY what it means. Take it for what it is, there is no hidden meaning whatsoever.

As I wrote to Groon, I think “traveling twice the speed of sound” is referring to the Concorde, launched in 1976 (song was written in 1977). It traveled approximately 1350 miles per hour; the speed of sound is 659 mph at an altitude of 50,000 feet, which is the height the Concorde flew.

My Opinion

@pookerella I agree with your analysis and math, goodbye.