Four giant pandas who had been beloved guests at Zoo Atlanta were returned to China on a special FedEx plane last weekend.The giant pandas, called Lun Lun, Yang Yang, Ya Lun, and Xi Lun, arrived back in Chengdu on Sunday, October 13.The return of the four pandas to China was “in line with Zoo Atlanta’s giant panda agreement with China, which expires this month,” the zoo said.Lun Lun and Yang Yang were both born in Chengdu, while Ya Lun and Xi Lun were born in Atlanta.Footage released by Zoo Atlanta shows preparations for the “FedEx Panda Express,” the plane which brought the pandas back to China. Credit: Zoo Atlanta via Storyful