Check-in and baggage transport services are two very important aspects of passenger boarding, including check-in services before boarding and baggage inquiry services after some passengers disembark. Check-in service is a boarding preparation service that passengers can handle at self-service check-in or manual counters according to their personal needs after purchasing tickets and before boarding. It mainly includes confirming passengers' boarding documents, verifying passengers' seat reservation, checking special passengers' application materials, issuing boarding passes, and collecting and transporting different types of checked baggage. Baggage inquiry service refers to the service of searching and processing for abnormal items such as damaged luggage and lost contents after passengers disembark from the plane. Check-in service has a direct impact on flight efficiency, flight safety, the reputation of the carrier and other aspects. Baggage inquiry service on the protection of the rights and interests of passengers' baggage transport, in the passenger transport link plays a pivotal role.