While the non-flying world has been fawning over this flight track, I'm having a hard time describing whether I find it "impressive" or not.
I mean, it is neat, and attention-getting, and overall a pretty cool thing. No denying that.
But -
Piloting skill - very little needed. Clearly it's a preprogrammed route being flown on autopilot.
Planning skill - definitely needed some. I imagine there were some airspace issues, and ATC coordination had to happen. Good job there.
Programming skill - I'm not sure. Are there apps that will convert a drawing to coordinates? Then load them into Foreflight, and send the route to the panel. Or was there a lot of hand-planning done to determine turn points and such?
Obviously almost all of the work to make this happen occurred on the ground. Once in flight, autopilot on, and sit back. Although it does look like there may have been a few points where the turn needed to be pretty tight, so the autopilot may have been clicked off at those points.
If I am wrong about the level of effort in any part of this, I am completely willing to be wrong and be amazed.
Although I think the average person thinks this was done like skywriting, all stick and rudder flying, and just having to visualize the whole picture while flying it.