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Jet engines used to be started by external generators which were connected to the axle of a jet engine.

These days, we use an internal electric starter. An electric motor inside of the engine can be started with the push of a button. Fuel begins flowing into the engine and then is ignited with a spark plug.

Jet engines used to be started by external generators, connected to the axle of a jet engine, which would start it up.

These days we use an internal electric starter. There is an electric motor inside that can be started up with the push of a button; Fuel will start flowing into the engine, and will be ignited with a spark plug.