So no-one was arrested at landing? If so: how would a case be built after the fact?

Perpetrator loses/wipes whatever device used to interfere with the Wi-Fi. Starting with passenger list, it could have been anyone, right?

I'm not talking about zooming in on most likely suspect(s). I'm talking about proving (legally) it was them rather than any other passenger. Never mind theoretical possibility of a device dropped/hidden somewhere on a previous flight of the plane, doing its thing after 'dropper' went elsewhere.

stories like this give me hope. If a company is willing to pay for this dingus's ticket (or they can afford to pay out of pocket), I might be able to break into the cybersec industry :)