I guess it's Flighty (https://apps.apple.com/us/app/flighty-live-flight-tracker/id...)
I love that people are into this. In the days before iPhones, I had "Microsoft Streets and Trips" + a USB GPS unit + Laptop. It was fun having it on a flight and seeing movement data in realtime. It was less fun answering questions from people who thought looking at the GPS data was somehow nefarious.
Streets and Trips was fun on a laptop for long car drives as you could live reroute in the car much like any old app can do these days but seemed somehow magical back then.
My kid liked to suction cup his GoPro to the window to take a time lapse movie of the flight and one FA told him he had to take it off the window because he was, and I quote: "modifying the structure of the aircraft and that's not FAA-approved".
"Another consideration, in the case of this type of equipment, is the applicability of the term "alteration". FAA Order 8110.3 7E, defines an alteration as "a modification of an aircraft from one sound state to another sound state". The use of suction cups, or other temporary methods of attachment (not including permanent mechanical attachments to the aircraft), would not be considered a modification to the aircraft."
https://mypilotpro.com/wp-content/uploads/2020/05/FAA-Camera...
But still, the aircraft is the the airline's property, not yours. If they tell you not do something to it, you don't get a choice in the matter.
That memo is about attaching it externally. Attaching it to an internal window is probably a non-issue.
I once had a security agent ask me to prove a GoPro was a camera because they didn't understand how there could be no screen or viewfinder. It was most frustrating because this was an area where they would have encountered it many times (lots of scuba divers).
Way before cellphones, I'd bring my 2m radio on the plane and make contacts on simplex. That was fun to throw your callsign out and say "aeronautical mobile".