I found this picture recently that I took of sunrise whilst heading due East on my flight out to Singapore last December to view the annular eclipse. The image was taken of the on-board media screen that also allows you to see the view from various camera’s mounted externally to the aircraft.
Seems to me a clear indication of a curve, no matching distortion of the A380’s wings so no “fish-eye” lens in use. The curve only appears on the horizon.
I wonder what reasons would be dreamt up to dismiss what I think is reasonable, convincing evidence of the globe that anyone prepared to jump on an A380 could see??