The person you interact with at the airport front desk (either for check-in or at the boarding gate) is most professionally known as a Passenger Service Agent (PSA) or a Check-in Agent. These individuals are part of the airport's "ground staff" or "ground crew." Their responsibilities are diverse: at the check-in desk, they verify travel documents (passports and visas), weigh and tag luggage, issue boarding passes, and manage seat upgrades or rebookings. Once you reach the departure area, these same agents (or their colleagues) become Gate Agents, where they coordinate the boarding process, make public announcements, and verify IDs for the final manifest. In some contexts, particularly for high-end or boutique airlines, they may be referred to as Guest Relations Officers or Customer Service Executives. While they are the "face" of the airline at the terminal, they work in close coordination with the Ramp Agents (who handle the physical loading of the plane) and the Flight Dispatchers (who manage the logistics of the flight plan). Regardless of the specific title, their primary goal is to ensure a safe, efficient, and orderly transition for passengers from the terminal building onto the aircraft.