New airplane concept: self running engines

Note : this concept would require designing a whole new plane all together . so this airplane lands and taxies to the gate plane connects to power from airport. this power is used to start up engine. once engine is started the turning engine generates power which goes to a battery and than back to the engine. now many resons why the idea is bad but can be worked on .
A.power generated will be less than engine needs to fly
B. A/C,power, inflight tv but its just an idea

What so a self driving car but for planes?

just the engine is running the power not the braking system like a car

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