if your departure is affected by the flight change, and you cancel the order on the day of your departure, please contact Ctrip as soon as possible and provide your flight change certificate and a copy of your ID card. All ground pick-up fees except air tickets will be refunded to you, so that you are not afraid of the flight change.

aviation is a complex and strategic human activity, which refers to the flight (navigation) activities of aircraft in the earth's atmosphere (airspace). The English word aviation comes from Latin avia or aero. Aircraft engaged in flight activities, also known as aircraft, are divided into two categories: aircraft lighter than air and aircraft heavier than air. The former, such as balloons and airships. Take off by static buoyancy of air; The latter, such as airplanes and helicopters, take off by aerodynamic force. Aviation is a complex strategic human activity. Refers to the flight (navigation) activities of aircraft in the earth's atmosphere (airspace), as well as scientific research and education, industrial manufacturing, public transportation, professional operations, air sports, national defense and military, government management and other related fields. Through the use of airspace and aircraft, aviation activities can be subdivided into many independent industries and fields, such as aviation manufacturing and civil aviation. We can often see people using this word from their respective fields, and its connotation is rich and changeable. Aircraft engaged in flight activities, also known as aircraft, are divided into two categories: aircraft lighter than air and aircraft heavier than air. The former depends on the static buoyancy of the air, such as balloons and airships, while the latter depends on the aerodynamic force generated by the relative movement with the air, such as airplanes and helicopters. According to whether it is manned or not, it can be divided into manned aircraft and unmanned aircraft.