Off topic: Winch cable launch for airliners

A lot of people have probably looked into similar idea already. Launch is the most energy intense part of a flight. Hybrid aircraft might become commercially viable soonish. My idea:

A winch, that
Pase 1, pull: pulls an airplane along the runway like a glider winch launch (might also skip this phase if that enables the cable to be lighter)

Phase 2, power: stays connected and provides electrical power to the plane through a high voltage cable for as long as possible. During this phase the airplane would accellerate as hard as possible.

Phase 3, return: decouples from the plane and returns in a controlled way, using a chute, drone or smth.

A lot of variations are imagineable.

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