De-planing, which refers to the process of leaving an aircraft, is not an antonym that can be easily reversed. However, we can find antonyms that are opposite in meaning to the concept of de-planing. The first antonym is boarding, which means to enter a vehicle or aircraft. The second antonym is embarking, which is similar to boarding, but is also used more generally to refer to the act of beginning a journey. The third antonym is loading, which refers to the process of putting something onto a vehicle or aircraft. All of these antonyms are related to the concept of getting onto a plane or other transportation method.