Which of the following terms refers to a passenger who requires assistance with mobility?

The term "Wheelchair User" specifically refers to a passenger who utilizes a wheelchair for mobility assistance, highlighting their need for help in navigating the airport or boarding the aircraft. This designation directly points to the nature of their assistance requirements, emphasizing the mobility aid they use.

While other terms may suggest special assistance needs or boarding priorities for certain passengers, they tend to be broader or less specific than "Wheelchair User." The choices that refer to priority boarding or special assistance do not exclusively indicate a mobility requirement or the specific tool that helps those passengers, making "Wheelchair User" the most accurate label for this context.