Well, not all of us think there's an ice wall. I personally don't.
Please do tell us why you don't "think" there's an ice wall--in a thread on that topic. For this Ice Wall thread, perhaps you'll consider the OP's question please. We've provided VOE of what's beyond the Ice Wall, the RE.
Please leave thread moderation to the mods, if you don't mind. I mentioned it in passing because there *are* threads about it, and there are certain obtuse RE'ers here that would see me stating I didn't think there was an ice wall in one thread, while actively participating in an ice wall debate on another, and would call it out as hypocrisy. Moreover, I felt that it would enrich the OP's experience to know that the ice wall hypothesis is just one of the many "flavors" of the model. This is a discussion forum, not a lecture hall.
Back to the point, your VOE doesn't prove a spherical earth, as a transpolar circumnavigation is still possible on a flat earth - and yes, even on the ice wall model, in theory, though I'd need to see the actual route flown to verify. An aircraft pilot would follow the lines of force, which are curved at the outer rim in the ice wall model by aetheric flow. This would lead the plane to ultimately turn and fly north again relative to the disc, most likely without the pilot's noticing at all, since all the instruments would indicate otherwise.
Just because I don't subscribe to a particular model doesn't mean it doesn't work.