I feel like you have to be brave messing with a plane's network. People tend to get really touchy when airplanes are involved.
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People do get nervous, and in theory you could probably break some kind of informational system utility if you kernel panic the box that booms up to the satellite receiver, but unless you're trying to get root on the plane's routers I don't believe there's a need to feel brave.
The braver part is publishing the results of this stuff online under your own name.
But "hacking" on an aircraft isn't going to be looked on particularly sympathetically by courts