Wandering in the sky

I flew yesterday on a Airbus 330-200 owned by KLM. In the headrest in front of me was a screen. The screen allowed me to access music, movies, television shows, games, and a flight tracker. Between this, a letter I was writing, and a book I was reading kept for occupied for the 15 hours I was in the air. Now, most important to me is the music. In perusing the music selection, I found some Johnny Cash. Now, I know a ton of his music and own several albums, but one song managed to have slipped from me. Luckily KLM had it in their selection. The U2/Johnny Cash song, The Wanderer. I really enjoyed the song and listened to it several times to try to determine what it meant. I got nothing.