Wow, very informative post. I didn't know the polar route is this unique. Many of my AY Japan flights took the polar routes, unfortunately I slept all of them at the time passing the polar. I got many copies of that certificate thoigh....Knowing about the possibility of seeing the aurora, I would have made an effort to stay awake.

But a friend immediate reaction for me flying polar is that I got exposed a lot more in cosmic radiation 😂