What is thing that I circled is for?

IMG_20210923_174856
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.

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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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Yeah.

IMG_20210924_113906
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)