Dear passengers, in the air travel, have you ever had such a doubt: clearly booked economy class, but can not choose the front of the first-class seat; There are also some special seats that can not be chosen by oneself. Today, let's solve the mystery. First, the choice of seats depends on the cabin. Economy, business and first class have their own standard of service and price differences. Economy class passengers naturally can not choose the front of the first-class seats, this is not only to ensure the interests of passengers in each class, but also maintain the necessary measures of Air Service Order. Secondly, the aircraft take-off with the important calculation to prevent weight imbalance. To ensure flight safety, the front and back seats are usually open at the last minute of check-in. In this way, the airline can be based on the actual situation of a reasonable weight arrangement to ensure the aircraft in the flight of the smooth. Moreover, some seats have special purposes and requirements. For example, some passengers who need special attention may lock up the front or special seats. The emergency exit seat is even more critical, because in an emergency, it needs to be able to evacuate passengers quickly. Therefore, the airline to determine whether the passenger's condition is suitable to sit in this seat, and then assigned. The first row is usually the only place to hang the baby cradle, in order to bring babies to the convenience of passengers, this position also need to stay, the airline according to the passenger's situation to determine whether to allocate. These seemingly“Troublesome” practices, in fact, are to ensure that every passenger's safety and comfort travel. Airlines in the seat allocation of careful consideration, is responsible for the height of flight safety, but also the greatest protection of passenger rights.