Traditional Culture Encyclopedia - Hotel accommodation - How many miles does China Southern need to upgrade?

How many miles does China Southern need to upgrade?

The required mileage is as follows:

Within 800 kilometers, economy class needs 6000 miles; 80 1- 1700 km, economy class needs 12000 km; 170 1-3000 km, economy class needs 15000 km; 300 1-5000 kilometers, and economy class needs 25000 miles.