There are some projects, such as this one: https://github.com/idiap/w2v2-air-traffic https://github.com/idiap/w2v2-air-traffic They transcribed 5000 hours of A

There are some projects, such as this one: https://github.com/idiap/w2v2-air-traffic https://github.com/idiap/w2v2-air-traffic They transcribed 5000 hours of ATC speech data (available for licensing, not free).