However, the "flight" is rarely about literal wings. It is a metaphor for:
There is a poignant bittersweetness to this dream. As the song suggests, "birds fly over the rainbow," and the dreamer asks, "Why then, oh why can’t I?" This highlights the human limitation—the gap between our infinite imagination and our finite, earthbound bodies. My Dream Is To Fly Over The Rainbow
To fly over it, rather than just toward it, suggests a desire for total liberation. It is the ultimate act of defiance against gravity and the mundane. While the rainbow represents hope, the act of flight represents the agency to reach that hope. The Psychology of "The Somewhere" However, the "flight" is rarely about literal wings