The antonyms for the word "deplaning" are boarding, embarking, and ascending. These words signify the exact opposite of deplaning, which is to exit or disembark from a plane. Boarding refers to the act of getting on a plane, typically at the beginning of a journey. Embarking, on the other hand, means to begin a journey by getting on a ship, train, or plane. Ascending denotes the action of moving upwards, such as climbing the stairs to board a plane. While deplaning is an essential part of air travel, the antonyms remind us that the journey starts and ends with the process of boarding and embarking.