Meeting again after half a year
Approximately 17 hours later.
Although the flight speed of the Artemis class helicopter was amazing and incomparable to any other helicopter built on the pre-apocalyptic Earth, the size of the world had almost quadrupled so flying from the eastern United States, across the Atlantic Ocean, Europe, and about three or four other small countries to China naturally required a lot of time.
(A/N: Yes, as strange as it may sound to you, the distance between the US and China is shorter through the Atlantic. You can search info about it at will).
The trip was not particularly smooth either as during the course of the flight there were several flying mutant beasts that attacked the Artemis class helicopter and among them were herds of First Order beasts led by some Second Order ones and there was even a big Third Order flaming bird that flew close to the helicopter before deciding to retreat after it sensed the terrifying auras in the interior.