Right. My comment didn’t assume a specific interface method (user accessible port / medical jack vs. something else) but rather a method to play the audio witho

Right. My comment didn’t assume a specific interface method (user accessible port / medical jack vs. something else) but rather a method to play the audio without having to be on the plane (which would certainly be my preference were I the prankster.) If it was actually done using a user accessible port intended for access to the PA, I would agree with you, it wouldn’t fall under CFAA/hacking type laws. Still could be problematic legally though. Microcontrollers are small enough now that there could be lots of interesting ways to interface. EDIT: Also, based on the OP, the PA gets power cycled repeatedly on at least one flight where this is happening. That’s much more intrusive. Or again… horny ghost