what’s the use of the cart that pushes back the airplane? Can planes not reverse without it?

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what’s the use of the cart that pushes back the airplane? Can planes not reverse without it?

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The wheels on planes aren’t motorized, the only propulsion the aircraft has are the engines.

Thrust reversers dont push air straight back, instead they push a lot of air out to the sides. Because engines are close to the ground, this can create a lot of noise, become hazardous to anyone standing somewhat close by, and can potentially knock up debris from the ground and potentially lead to that debris entering the engine

It also burns fuel, which airlines don’t like wasting unless it’s necessary.

Planes reverse by redirecting the air out of the back of the engine forwards — called a powerback. While most aircraft can do powerbacks, it is usually not allowed by company procedure since it blows debris on the ground up into the engines. Planes with tail mounted engines were more likely to powerback than planes with low wing mounted engines.

https://en.wikipedia.org/wiki/Powerback

Airplanes can reverse. Most terminals windows cannot handle the force from the jet blast, along with the bag carts and everything else on the ground that would have to be secured.
When planes land they use reverse thrust to slow down.
I asked this same question to a few pilots .

They technically could using reverse thrust but it uses a lot of fuel, can suck in debris, damage the gate, and hard due to the pilots not being able to see the rear of the aircraft. It just makes more sense to have the ground crew do it