John Mackey wrote "Turbine" to deal with his fear of flying.
"[...] But in the back of my mind, I'm always aware that we're up quite high — and our lives (and that beauty) depend on these massive pieces of machinery. If that machine (in this case, the percussion) should fail, we'd all be in serious trouble, so I just keep my knuckles gripped to the armrest, look out at the clouds, think pretty thoughts, and hope that the pulse of that engine never lets up."
— Mackey, in his commentary on the piece
Ian Gillan of Deep Purple has, or at least had, a fear of flying. On tours, he often preferred to travel with the trucks transporting the equipment, befriending many roadies. He would buy double tickets when actually going by plane to avoid being crowded. This is referenced/fictionalized in the song Mitzi Dupree, where he finds Mitzi in one of his seats: