Airplanes are designed to be trimmed during flight. Trimming the plane makes it dynamically and statically stable so that keeping the same flight profile requires minimal control input. For good flying conditions, you should be able to trim the plane and not touch the controls for an extended period of time (though doing that is not generally advised). Apart from that, big planes like airliners and even some more modern general aviation planes have autopilot that can take care of steering the plane for most of the time.
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