I think that one of the major issues in the short to medium term with ML/AI in aircraft will be that of certification. The regulations surrounding anything electronic that could have an effect on the flightpath are lengthy and complex. It’s one thing approving a documented, single-threaded application written in a “safe” language running on well-known hardware (and that can take years). Replace that with a black box that seems to do the job most of the time but no-one really knows how and you’re going to have to re-write the rules comprehensively.
This is not to say it won’t happen eventually but there are parallels with self-driving (level 5) cars and fusion power - it’s always some time in the future and when you get there, it’s more difficult than expected and the date gets pushed into the future again.