What is thing that I circled is for?

Is it to like a stopper or something?

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APU. It provides electricity while the plane is on the ground.

That’s called a GPU (Ground Power Unit). When on stand, aircraft connect to them to receive power for the electrical systems (lighting, air conditioning etc) when the engines are turned off.


So it was basically the first thing that appear

Indeed, as per reality, they are one of the first things attached to an aircraft upon arrival.

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Is that icon for opening doors because I saw the door open when I click that?

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Yeah, and the stairs/jet bridges

Apu (auxiliary power unit) is to help start the generators and battery when there’s no gpu I’m sure

Yeah that sounds about right (I said a completely wrong thing do I edited this lol)