Which term refers to a passenger who is taking a flight for the first time?

The term that refers to a passenger who is taking a flight for the first time is "First Rider." This designation emphasizes the novelty and unique experience of flying for the first time. It reflects the excitement and apprehension a new passenger may feel, making it a significant milestone in the journey of air travel.

The other terms provided do not apply to first-time passengers in this context. A deportee refers to someone who is being expelled from a country, often for legal reasons, and does not pertain to the experience of a regular flight passenger. A diverted flight indicates a situation where an aircraft must change its intended destination due to various factors, which is unrelated to the passenger's experience. Lastly, destination simply refers to the place where a flight is intended to land, which does not capture the essence of a first-time flyer’s experience.