Not my field so by all means somebody who understands RF and wiggly-amps much better than me shoot me down, but...
Lets say a new aircraft were designed so that the floor, sides, front and rear of the cabin (including critically the cockpit door) were designed as a Faraday cage, and all the critical electrics and electrics or electronics passed outside that (mostly through the floor) - ceilings can still carry Pax entertainment system electronics, hydraulics, etc. Would this...
(a) Provide a reasonable guarantee of non-interference with systems
(b) Keep the pax happy that they can freely play electronic games, etc.
(c) Block mobile phone signals in any useful direction, thus guaranteeing peace and queit for those not wishing to partake of other peoples conversations, also guaranteeing income for the airline for their overpriced built-in yupee-phone system.
Seems reasonable to me, but then, I'm not an RF engineer.
G