What service would a traveler request if they needed help upon arrival at the airport?

The correct choice is MAAS, which stands for "Meet and Assist Service." Travelers who require additional support when they arrive at the airport would request this service. It is designed to provide assistance to passengers who may need help navigating through the airport, such as those with reduced mobility, elderly travelers, or anyone who may require special attention upon arrival. The MAAS service can facilitate a smoother travel experience by ensuring that the passenger is escorted through various airport procedures, such as immigration and baggage claim.

In contrast, other options represent different services that cater to specific needs rather than general assistance upon arrival. For example, STAF refers to a service for unaccompanied minors, which is different from providing arrival assistance. OXYG indicates the need for supplemental oxygen, a medical necessity rather than an arrival support service. INF / INFT pertains to infants and the services associated with their travel needs, not necessarily assistance for arriving travelers.