For my airline, we have a limitation that we cannot fly
commercially for another airline. I occasionally fly as ferry/delivery pilot outside of my airline. One limitation however, we cannot exceed 120 hours flight time monthly nor 1,000 hours flight time yearly.
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If I would fly commercially for another airline, on a temporary contract, I have to advise my chief pilot, obtain his approval, and my salary is suspended during that period of time. Hours logged must be accounted in flight time limitations, upon my return.
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Private flying (light airplanes) is not included in such limitations. I did flight training of aero-club cadets, or private flying for fun. No problem for that.
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Happy contrails