I think you should try reading the entry you're refering to.
You'll note that for a faraday cage to be effective, any holes in it's surface must be smaller than the wavelength of the EMP - usually nothing much less than a solid surface is going to cut it, and as as cars, trucks and buses have windows, etc....
Also, to be effective, it must be grounded. A cars rubber tyres are an effective insulator preventing the necessary grounding taking place.
Parts of a car may be protected, but as the wiring looms commonly travel through all parts of the vehicle, AND anything worth protecting is almost invariably connected to something which is in an exposed area....
As stated in the previous EMP thread, tracked, armoured vehicles are less likely to be effected because they're surrounded in armour AND their metal tracks effectively ground them. There is likely to be some impact on them however, but it is likely to be less than a civilian vehicle.
It really does come down to luck of the draw on the whole though. Nobody to date, and I rather doubt in the future too, has conducted wide scale testing of vehicles specifically to determine the effects of EMP. We can assume though based on the minimal testing which has been carried out, that some vehicles, regardless of age, will be more or less suceptible than others.
Aircraft are another matter altogether. I believe most are built specifically with the possibilty of outside interference in mind with vital components shielded and redundant systems. This is especially true with the larger passenger aircraft carrying millions of people every day, and even more so (one would hope) in the multimillion dollar military aircraft our various governments are so proud of. The average private small prop driven aircraft on the other hand....
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