method 1: call the official customer service hotline of the relevant airline and select the relevant manual service. first, consult the air ticket position and whether the passenger's condition meets the seat selection standard. if it has arrived, you can ask the customer service to select seats in advance for you. Method 2: You can also choose seats when you swipe your identity at the airport self-service check-in machine and check flight information. Method 3: Check-in at the manual counter before boarding, or let the staff handle seat selection. (The premise of these two points is that the cabin and passengers' conditions meet the criteria for seat selection.) Method 4: Go to official website of the relevant airline to select seats. Precautions for boarding: Arrive at the airport two hours in advance. Generally speaking, because the airport is very big after all, the process from checking tickets at the airport to boarding the plane is more time-consuming, and it takes a lot of walking before boarding the plane. The plane is usually late, so in order to avoid missing the plane, we must arrive at the airport in advance. It is forbidden to carry prohibited items. Such as large-capacity charging treasure, large-capacity liquid goods, lighters and other dangerous goods, shall not be carried. Don't carry too much luggage, or you need to check it. Generally speaking, what is the weight of luggage stipulated on the plane can be determined. If it is overweight and needs to be checked, it will take more time to go through the check-in procedures. Don't eat too much before boarding the plane. There will be obvious bumps during take-off, which is normal. You may feel uncomfortable when you take the plane for the first time, and it is easy to feel sick and vomit when you are too full. Make-up water and skin care water should not exceed 1ml. Girls, in particular, should bring cosmetics and other items. It should be noted that some liquids should not exceed 1ml, and too much should be checked.