"The point is, that data is already made available to the passengers, via a link from the primary network. His solution would be to provide the same information without compromising the network."
Well my solution would be to remove it altogether instead giving the passengers information about the two main states that the plane can be in : Ground - Sky. As a passenger having no real need for constant altitude/direction/speed information this is more than sufficient, as an added bonus the requisite equipment is already present on all commercial planes - Windows and Eyes.
If we are that worried about security and the airlines are worried about costs (Any extra equipment will increase costs) then the obvious solution is to remove it altogether.
Biting the hand that feeds IT
