Clouds are made out of water particles suspended in the air. They move with the flow of air they are suspended in. If an airplane flies through a cloud, it disrupts the airflow, and the water particles move in the distrupted air flow ([see here](https://www.google.com/imgres?imgurl=https%3A%2F%2Fi.pinimg.com%2Foriginals%2F29%2Fee%2F7b%2F29ee7bcfe94cf5b91bb82942debdbc7f.jpg&imgrefurl=https%3A%2F%2Fwww.pinterest.com%2Fpin%2F286119382548759257%2F&tbnid=Bu2NNdVUYqo9JM&vet=12ahUKEwj-qfHPp5_tAhUJD60KHdsYDbEQMygAegUIARCyAQ..i&docid=QdZCB8ozT92HPM&w=450&h=302&q=aircraft%20cloud%20wingtip&ved=2ahUKEwj-qfHPp5_tAhUJD60KHdsYDbEQMygAegUIARCyAQ)). The water particles are still all there though. The plane doesn’t absorb them or anything, so once the air settles down again they be more or less in the same place they were before.
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