Let me now address the non-radio systems. In an air transport aircraft, just behind the decorative wall panels there are miles of wires. Signals of all types pass through these wires. Some are rather benign such as the signal that goes from the light switch on the arm of the passenger seat to the lamp over head. Others are highly critical such as the signals that actually control the aircraft.
Radio waves can induce signals on wires.
I remember, as a young boy my neighbor complained that he could hear my voice on his telephone. This was because his telephone wire was picking up the legal signal from my amateur radio transmitter. The highest levels of protection are used on the critical signals used to control the aircraft. These signals are protected so well they can operate through a lightning strike without failing. Other signals are not that robust.