You'd better change it in the bathroom on the plane, otherwise it will be very cold if you want to take a bus ferry when you get off the plane.

You can also change it at the baggage claim area. There is a special dressing room in the baggage claim area of Changchun Airport, which I have seen.

At present, the temperature is between-15 and -30, which is relatively cold. Please check the weather forecast before you leave, and don't catch a cold.