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Why isn’t Avatar in 16:9?
(lemmy.fmhy.ml)

A community for all things related to Avatar: The Last Airbender, Legend of Korra, cartoon or live action TV, movies, comics, novels, etc.
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It takes years for production companies to change their equipment over for big changes. Keep in mind the change from 4:3 to 16:9 also included a huge jump in resolution and the move to digital media.
Many shows would stay 4:3 till their end.
There where a whole lot of black bars and stretched content for much of the 2000s