Well, I got to being curious because it seemed somewhat impressive that a challenger could fly from Anchorage to China and back in the timeline. It Arrives in Anchorage at 12:11 AKDT on the 23rd, it then takes off again at :45 AKDT on the morning of th 25th, but I listened to the ATC traffic from the time it left to the time it departed for Calgary, and I never heard it depart for China.
So then I thought, I wonder how they got from China to Anchorage, so I listened to the traffic from the 21st and 22nd as well, but I didn't really hear anything that sounded like it was coming in from China (because it was mostly helicopters and jets) - the only thing I did hear was a Globemaster, but that seems overkill.
A mystery.