Beginning with violet, each color of the rainbow symbolizes a different aspect of God's sanctification. Before the first day of re-creation, the Justice of God (violet) had already Judged Satan and the Earth. The Earth was a wasteland and covered in ice as symbolized by the color indigo.
Wonder Woman has superior strength, speed, and agility. She can fly and is trained in hand-to-hand combat. She also had the ability to talk to animals. In addition to her natural superpowers she has some great gear, too:
Crisis on Infinite Earths retroactively enabled Wonder Woman to fly since the very beginning -- when Hippolyta made Diana out of clay and granted her the powers of beauty, power, strength, speed and flight. When it comes down to it, the invisible jet is necessary if Wonder Woman does not have the ability to fly. If she can fly, the vehicle becomes almost pointless to have. This is why the invisible iet really hasn't been seen that much since Wonder Woman was given flight, aside from the casual reference or joke.