Wonder Woman's invisible plane represented the peak of Amazon engineering. When it was decided that Wonder Woman would venture forth into the modern world of mankind, the Amazons provided her with an invisible stealth plane that could make Transatlantic flights without the need for refueling. Although the plane itself was entirely invisible to the naked eye, its pilot and occupants were still very much visible, giving the illusion of a group of people sitting in the sky. Wonder Woman could interact with the invisible plane via telepathy and sometimes used electronic devices within her tiara to command the plane's course and flight patterns.
One legend has it that the invisible plane was once a Pegasus that had been given to Princess Diana by the Gods of Mount Olympus, provided that she had the skill to tame it. As science overtook sorcery, the concept of the flying Pegasus evolved into the invisible plane.