Duty-free shopping is allowed on domestic flights at the airport, and the process is quite simple. Passengers only need to bring their valid passport and boarding pass to enter the duty-free shop to purchase goods. Duty-free shops are a special type of shop authorized by the General Administration of Customs and usually set up in specific locations, such as ports, transportation vehicles, cities, dedicated to diplomats, ship service points, and foreign exchange duty-free shops serving people going abroad. The goods sold in these places are subject to special customs supervision, and duty-free services are provided to customers who meet the prescribed conditions. Therefore, as long as they meet the conditions, passengers can experience the fun of duty-free shopping during domestic flights at the airport.