You should be responsible. It is the responsibility of the airline to keep the items checked by passengers. According to the airline's "Terminal Compensation Rules", for passengers who transfer multiple times, the airline taking the terminal is responsible for the compensation.
On July 11, an international student in the United States, whose Weibo name is "Victoria-born cellist", posted such a help message on Weibo. Since his visa was about to expire and flights between China and the United States were still limited, the student bought a round-trip ticket from Los Angeles, France, Paris, and finally to Tianjin. From Xiao Wu’s daily Weibo, we can see that she is a music major and studies cello. However, when she successfully completed her voyage and arrived at Tianjin Airport to collect her luggage, she never found her cello!
Perhaps due to the power of the Internet, Air France staff contacted the Victoria-born cellist and said that her cello was now safely stored in the baggage department of Paris Charles de Gaulle Airport. On the morning of July 14, Air China staff contacted and told the classmate that her piano had been boarded a cargo plane bound for Beijing. In the afternoon, the classmate received the cello unscathed.
The baggage loss rate, like the flight delay rate, is an important indicator of airline reliability. All major airlines in the world inevitably experience some incidents of lost checked baggage. Such accidents often occur at airports where people are transferring to other airports. It remains a critical point in the journey of transferring luggage from one plane or airline to another. The error rate of transfer baggage accounts for 46% of the total baggage error rate. Under airline terminal compensation rules, airlines using the terminal are responsible for claims from multiple connecting passengers. Passengers don’t have to worry about finding staff. Airport ground staff and airline staff will leave work after all flights have arrived and there are no problems. However, passengers need to pay attention and report to the staff promptly if they find that their luggage is lost.