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Soon enough cars are going to have as much electronic equipment as planes. Auto drivers, traction control, electric motors and computers to control all this, along with radios and antennas so the cars can call home automatically. I wonder how they're going to deal with cell phones in cars.
Also considering that planes fly at high altitudes they are exposed to a lot of cosmic radiation, I remember reading somewhere that a single flight exposes its passengers to the equivalent of n X-ray scans.
Since I'm pretty sure that they will be dealt with, it's really a matter of hardening plane systems, which presumably costs money, which is why it isn't done.
I don't know enough (and googling seems to indicate no else does either) to comment on whether today's airliners are really vulnerable to electronic devices or not. But it seems pretty clear that there is no fundamental reason they cannot be designed to not be.
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