Airline ticket agents sell tickets at airports or downtown ticket offices. They also assign seats for passengers and rebook passengers who miss their flights. They often answer questions about airline schedules, fares, hotels, and taxis.
Agents also handle passengers' luggage. First they weigh it to make sure it falls within airline guidelines and then attach tags that indicate where the bags should be taken off the plane.
At airport gates they announce flight departures and board passengers. It is their job to ensure that flight attendants have the equipment they need.