Re: Hmmm...
Endangering a flight. Locally its a 20 year sentence. Absolute liability, so you can't cry I didn't mean to.
I'd expect it to be the similar in other jurisdictions, especially given various international agreements.
Murderers can get less. So get the police to really investigate, charge and jail the people involved.
Theres a good chance that the person has a mobile phone, so there's only so many people in the cell zone.