Yes it can be, as a mater of fact a lot of people do work or entertain themselves with laptops while traveling on air craft.
Yes, you can bring a parachute on an airplane, but it must be packed in your checked luggage and not carried on board with you.
A lot of items cannot be carried on an airplane after the 9/11 attacks on the World Trade Center. Some of these items include sharp objects and liquids over a certain quantity.
Everyone on board would blow up
It all depends on the type and size of airplane.
Yes, you can bring your laptop on board with you when flying with an airline.
To ensure compatibility between your airplane laptop charger and the power outlets on board, check the voltage requirements of your charger and the power outlets on the plane. Most airplanes provide power outlets with a voltage of around 110-120V, so make sure your charger is compatible with this range. Additionally, consider using a universal adapter or converter if needed to ensure a proper connection.
You can board it and you can also fly it.
Airport
Yes.
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You would need a stereo 3.5mm jack to take the sound from the laptop, and depending on the inputs on the board you would likely use 2 mono 1/4'' jacks.
Yes - there's no danger in smoking on board an airplane, passengers in the early days of commercial aviation were allowed to smoke. The disadvantage being that some air is recirculated, and those non-smoking passengers would be exposed to second-hand smoke. Today that would be totally unacceptable and thus, smoking is prohibited on board aircraft.