Spotted light moving up and down from plane

Spotted light moving up and down from plane
Time: 26th December 2024, 18:35 GMT+1

Location: 20 minutes prior to arrival at Tromsø

Flight: SK4424


I was on a flight from Oslo to Tromsø Norway and around 20 minutes away from arrival I noticed this light outside the window looking east.

I didn't think much about the light until I saw it ascend whilst the stars behind stood still. As soon as I saw it ascend I pulled my Google Pixel 6 and started filming. 

In the video you can see the light ascend and descend. I thought it might be because the plane is turning but according to my phone's gyroscope when recording, the plane wasn't rolling in either direction.

The video posted is raw and metadata should be correct. 

I am not sure what I saw but I would be happy to get to the bottom of it, if it's a star or another plane that's fine.