What are the climatic characteristics of Changsha, Hunan?

Before or within 7 days after takeoff. Passengers can get their travel itinerary at the ticket sales office or the e-ticket service counter at the airport within 7 days before or after the flight takes off. If the ticket is not used, you can print the travel itinerary within one year. When purchasing an e-ticket, you should ask the issuing unit for "Travel to travel itinerary" after payment, and "Travel to travel itinerary" is one ticket, which will not be reissued if lost. The easiest way to distinguish the authenticity of tourist travel itinerary is to check whether the last four digits of the serial number printed in the upper right corner of tourist travel itinerary are consistent with the verification code. If the two are inconsistent, the tourism travel itinerary is an invalid invoice. You can also compare your travel itinerary under bright lights, and you can see the watermark signs printed with the words SW and MH. Another method is that after travel travel itinerary copies, the words "Copy is invalid" will appear on the yellow bar of the copy. If you don't get the passengers in the travel itinerary after purchasing the air ticket, you will get an e-ticket number. You can verify the authenticity of the e-ticket in the following ways. First, report the electronic ticket number and my ID number to the staff of the airline customer service department by telephone, so that they can distinguish the authenticity of the ticket;