First I would think on digital wired transmisions between all the plane components. Something like a digital network between computers and actuators. That way it could be only a pair of cables all around the plane transmiting and receiving. One would be the main and the other a backup. If that works good then wifi could be next step.
It would help the discussion if you found out a bit more about aircraft systems first, before posting.
Digital networks and digital buses in aircraft exist for about the last thirty years, and then some.
And there's more than "a pair of cables". Try to read up on redundancy....