WARNING: The following contains spoilers for Wonder Woman 1984, streaming on HBO Max and playing in select theaters.
Wonder Woman 1984 helps to cement several of the DCEU Amazon's powers. One of these happens to be flight, which is an ability that Wonder Woman has a somewhat tenuous relationship with. While flight is more associated with Superman, it has indeed been one of Wonder Woman's powers for years. This wasn't always the case, however.
From using an Invisible Jet to gliding, Wonder Woman had quite a few years of crawling before she learned to fly on her own. The Post-Crisis on Infinite Earths reboot changed this, however, and since then, Diana has occupied the skies as much as a Kryptonian or a Martian would. Here's the comic book history of how Wonder Woman gained the power of flight.
During the Golden Age, Wonder Woman could not fly on her own power whatsoever. She could run at great speeds and jump equally as high whenever she took off, but actual flight was outside of her repertoire. Said speed and athleticism was the result of her Amazon training, and at the time, her powers were not divine in origin. The general idea was that anyone who underwent a lifetime of Amazon training could become like Wonder Woman, who herself wasn't really any stronger than the other Amazons.
To travel long distances, such as going to other countries or even into the depths of space, Wonder Woman employed an invisible robotic plane. Better known as the Invisible Jet, it would make both itself and its occupants undetectable, though said occupants were rendered as being visible for the sake of convenience to the readers. Wonder Woman was created by William Moulton Marston to be on equal footing to Superman, who initially couldn't fly either. Sadly, this level playing field was greatly diminished once the Man of Steel gained additional powers such as flight, super breath, and x-ray vision.
During the Silver Age, Wonder Woman still used the Invisible Jet, but she would also gain the ability to glide on wind currents. This wasn't true flight, however, and she was still unable to take off into the skies like Superman or Martian Manhunter. Like a lot of Silver Age elements, this gliding waxed and waned with the moon, showing up whenever the plot required it. This ability would also occasionally fail her, making the Invisible Jet her most trustworthy method of flight.
After Crisis on Infinite Earths, Wonder Woman was rebooted by writer/artist George Perez. This reinvention of the character emphasized her ties to the Greek pantheon more than ever and increased her powers to levels unseen beforehand. Once the queen of the B-listers in terms of strength, Wonder Woman was now second only to Superman, Captain Marvel, and Martian Manhunter in raw physical power. Likewise, she could also soar the skies just like them, too.
In Diana's new origin, she was blessed by several of the Greek gods when her mother molded her from clay. These blessings included her immense strength, beauty, wisdom and immunity to being burned. From the god Hermes, she gained not only superhuman speed, but also the power to fly. For this reason, she never even had an Invisible Jet for several years.
The New 52 reboot would initially have her without flight, but she eventually gained it from a familiar source. Facing Apollo and Athena on Mount Olympus, Diana was bequeath with a divine feather from Hermes. Faster than ever and now equipped with the power of flight, Diana made quick work of the wayward moon goddess. Since then, flight has remained an important part of Wonder Woman's skill set, with the movies now following this example.