When someone commits assault/ criminal offences on a plane?

Where would they get arrested/ charged? Would it be from the destination they departed from or the destination that they’re going to land in?? Let’s say a plane is leaving Montreal to London and about half way towards the journey, someone gets angry and starts assaulting people - would they get arrested or... show more Where would they get arrested/ charged? Would it be from the destination they departed from or the destination that they’re going to land in??

Let’s say a plane is leaving Montreal to London and about half way towards the journey, someone gets angry and starts assaulting people - would they get arrested or charged in Canada or London?
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