The Postal Aviation Flight CF9051 lands at Xining Caojiapu International Airport on Jan. 6, 2021, marking the official opening of the largest all freight air route in Qinghai-Tibet Plateau. (Photo: China News Service/Sun Rui)

Satpostal goods are being unloaded on Jan. 6, 2021. (Photo: China News Service/Sun Rui)

The special local products of Qinghai Province ready to be transported to Nanjing by this flight on Jan. 6, 2021. (Photo: China News Service/Sun Rui)

A staff member of airport is disinfecting the cargo on Jan. 6, 2021. (Photo: China News Service/Sun Rui)

Staff members are unloading postal goods on Jan. 6, 2021. (Photo: China News Service/Sun Rui)

The crews of Postal Aviation Flight CF9051 take a group photo on Jan. 6, 2021. (Photo: China News Service/Sun Rui)