A General Sales Agent (GSA) is an agent appointed by an airline to represent the airline and sell its products and services to customers within a certain territory or region. The GSA is responsible for sales, marketing, and customer service for the airline, and may also handle other functions such as ticketing, airport operations, and cargo.

The GSA acts as the main point of contact for customers in the territory or region it serves. They are responsible for promoting and selling the airline's products and services, such as air tickets and cargo space, to local customers such as travel agents, tour operators, and corporate clients.

GSA also responsible for managing customer relationships with their clients, handling customer inquiries and complaints, and helping clients with ticketing and booking. They are also expected to report on market conditions and provide feedback to the airline on how to better serve the market.

In addition to sales, the GSA may also handle other aspects of the airline's operations in the territory, such as airport operations and ground handling services. They are expected to maintain a good relationship with local authorities and airport officials, and to ensure that the airline's services comply with local regulations and standards.

GSA can also be appointed by other modes of transportation such as shipping lines, train operators and bus companies to perform similar functions.

In summary, a General Sales Agent (GSA) is an agent appointed by an airline or other transportation companies to represent them and sell their products and services to customers within a certain territory or region. They handle sales, marketing, customer service, and other functions such as ticketing and airport operations, as well as maintaining good relationships with local authorities and airport officials.

The GSA receives a commission of around 3–5% on all revenue tickets and unit of cargo space sold in the region that it represents.

All costs related to running the GSA's business are the responsibility of the GSA including insurance, rent, general office expenses and any travel within the country or region needed to promote and sell the product.