From what I understand, they're a weird kind of mp3 which is easily converted using ffmpeg.
In your library, near the right top corner, you can select "Normal Quality" (formerly called "Format 4").
This didn't work for me, perhaps because I am using Audible Germany, but it has been a while and it seems to work for other people. Then use either this script, or just grab the first four bytes as hexadecimals in little-endian (backwards notation reverse them). Because Android hates it when people can access their own files, you probably need root to do this. Temporarily install the app and grab the /data/data//files/AudibleActivation.sys file.The activation bytes can be found by a few methods: aax files can also be converted with ffmpeg, but you need your unique "activation bytes": ffmpeg -activation_bytes AABBCCDD -i YOURBOOK.aax -codec copy OUTPUT.aac aa files are no longer available for download and recommends to install their tracking app instead. aa files from the website, you can now only download.
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