It's the only way to fly.

As a standalone line, “It’s the only way to fly” functions as an idiomatic endorsement: the speaker is saying that a particular method is not merely preferable but definitive—the proper, even exclusive, way to do something. The phrase plays on the literal act of flying (by plane, by wings) to suggest ease, freedom, or superiority, and it is often used as a punchy slogan or tagline. Because it is presented without surrounding text, it can read either as practical advice (the best way to travel) or as a metaphor for living or working—implying that commitment to a certain approach is what enables success or transcendence.