Enplaning, which refers to the process of boarding an aircraft, can be replaced with a number of other words, depending on the context. Some of the most common synonyms include embarking, entering, and boarding. Other options might include the more general term, getting on, or the more specific phrase, climbing aboard. For those looking to add a touch of formality, the phrase, taking one's place on board, might be appropriate. Ultimately, the choice of synonym for enplaning will depend on the writer's purpose and tone, as well as the specific context in which the term is being used.