A round-trip ticket consists of two one-way tickets, each with its own flight information. The itinerary is a voucher for the reimbursement of passengers. A complete trip to travel itinerary is required for one-way and round trip to prove the travel information of passengers. One tour of travel itinerary can make it convenient for passengers to check and check information at any time during the trip, and avoid the confusion between the two tours of travel itinerary.