First of all, you must make sure that the economy class cabin of the flight allows for upgrade. Then there are three ways to upgrade, which are similar for different airlines. Method 1: Call the corresponding airline customer service before checking in. Generally, if you report your ID number, they will be able to check the ticket and upgrade it if possible. You need to pay the price difference to upgrade. If you are a member or have a corresponding credit card, you can use miles or points to deduct it. If not, you can only pay the difference.

Method 2: After arriving at the airport, go to the check-in manager counter to apply for an upgrade. If you do not get the ticket, you need to show your personal valid documents (ID card, passport, Hong Kong and Macao pass) after getting the ticket. In China, generally just show the ID card to upgrade. After getting the ticket, you need to show the original ticket to upgrade. You need to pay the price difference to upgrade. If you are a member or have a corresponding credit card, you can use miles or points to deduct it. If not, you can only pay the difference.

Method 3: You can also request an upgrade after getting on the plane. In this case, you need to assist the flight attendant. The information you present is the same as above: valid personal documents (ID card, passport, Hong Kong and Macao pass) As well as the original air ticket, the upgrade can be carried out after paying the price difference (some companies only accept the price difference at this stage), miles or points.